Hagrid led them to the parchment store. Harry was appalled. Quills! What was this, the Middle Ages? He bought the recommended amounts of parchment and ink, a bottle of color changing ink, an ever full dicta-quill figuring it could be useful for note taking, and four quills so he could figure out what kind he liked if any. Figuring if he didn't he'd just use the steel nib pen he had in his drawing stuff. He ordered parchment marked with his family crest for correspondence with the goblins or possibly solicitors and sealing wax. He saw and got a "So You Want to Write" Kit it was a basic calligraphy instruction guide aimed at children just learning to write but since Harry had never held a quill he figured it was a good idea.
Then they went to the bookstore. In Flourish & Blotts Harry and Petunia weren't sure which way to look. Hagrid helped Harry collect his school books while Petunia got in line to get some help finding books she knew Harry would need for their plans. She heard a boy ask for a muggleborn information pack, and figured Harry would need one of those as well. She got to the counter and the clerk asked "May I help you?"
"Yes I was wondering if there are any books on etiquette and sort of a who's who in the wizarding world. Also I need a muggleborn information pack."
Petunia ignored the clerk's rolled eyes and followed her to the section with the requested books. Natures Nobility:A Wizarding Genealogy, Helga's Guide Of Do's and Don'ts For Young Witches and Wizards, Witches and Wizards Past and Present That Have Influenced our World Self Updating Twenty-first Century Edition. Petunia figured that would be a good start.
"Anything else I can help you find?"
"History." The clerk lead her to another part of the store, on the way they walked past the children's section. Petunia was both surprised and outraged to see Harry's name on many of the books for sale. "Excuse me but who-"
"Harry Potter? He's the Boy-Who-Lived, savior of the wizarding world." the clerk gushed.
"Really?" Petunia drawled. "Can I get one of each?"
The clerk cheerfully started pulling them while directing Petunia to go two more rows and on the left to the History section. In the History Section she found many books four mentioned Harry prominently and she was furious that there was a book called Tragedy and Triumph: The Potter Story by Rita Skeeter. Harry met her there and grabbed the book that was to be his textbook. "Anything else Aunt Petunia? Oh wait there's a book about Hogwarts, I think I want to know as much as I can before I go there."
"I'll just grab a last few, I'll meet you at the register."
Harry left and the clerk came up, "Is there anything else?"
"Yes, does this store have any books about laws governing the wizarding world?" Petunia gave the clerk a bright smile. She found a couple of books about the specific laws she was most interested in (libel, child protection, and muggle protection) and one of general laws that she figured Harry had better know. Harry wound up using his trust vault key to authorize payment for all the books they got. Petunia was relieved that Hagrid was mostly hanging back and not supervising their every purchase or she suspected that Dumbledore would be a very unhappy man.
The giant then led them to the next shop. Harry had encouraged Hagrid to blather on about what he thought and the magical world since Harry "didn't know anything." Hagrid lead the way into the cauldron shop, where Harry got the pewter cauldron he was supposed to, the scales, and Dragonhide Gloves. He looked at the telescopes but asked, "Aunt Petunia, up in the attic at home there's that 114mm reflector telescope Dudley got at the Grunning's employee picnic, he doesn't care about it. Heck he's never even taken it from its box, and it's just collecting dust. Would it be possible for me to take that one to school instead of spending money on one of these?"
Harry's sense of thrift pleased her. She agreed.
"If he needs protective gloves then why aren't there goggles as well?" Petunia asked. Hagrid ignored her and so did the shop keeper. Harry thought it a valid question and resolved to use some of his new found wealth to get a pair.
Then they went to the apothecary, this was one of the stores that had one of those Potter signs that Harry and Petunia found so annoying. Harry approached the shop owner and overheard him say to a customer who by the looks of him had to be related to that obnoxious boy from the robe shop. "A Slytherin first year kit."
"Here you go Mr. Malfoy. That will be six galleons."
The blond threw the money on the counter "Six Galleons, highway robbery if you ask me."
"Don't blame me, it's those extras the Professor wants his snakes to have."
The blond brushed past Harry.
"What's the difference?" Harry asked.
"Who are you?"
"I want to know the difference between the standard student kit and a Slytherin kit."
"Snape has three supplemental guides and a better quality and variety of tools in the Slytherin kit so his students can have a leg up. Oh and the vials are charmed unbreakable."
"What about the actual potion supplies?"
"Those are bought by the school and kept in a student supply cupboard. Part of your tuition.
"I want a Slytherin kit and you're going to give it to me for the price of a standard kit."
"Why should I do that, you brat?"
"Because I'm Harry Potter," He briefly brushed his hair from his forehead. "and you've been using my name to promote your store without my permission. You co-operate and I'll keep my mouth shut. You don't, well it could be bad for business."
"You sound enough like a snake. I reckon old Severus won't be too happy, he hated your Da, he did."
Three galleons later Harry left the store. At the trunk store a similar thing happened. The shop owner fussed a bit more, before giving in and agreeing to sell any trunk to Harry at cost. Harry carefully examined all the trunks. Hagrid came in and asked what was taking so long. Harry merely acted the excited schoolboy wanting to know more about all his possible options. Hagrid wandered back out. Harry finally decided on a three compartment trunk with a magic signature lock and featherlight charms. He noticed school bags but didn't like them and asked if the shopkeeper had ever charmed a muggle backpack. After a little grumbling and some dickering the shopkeeper agreed to charm a pack if Harry sent it to him. As he bid them good day, he mentally allowed the BWL was a nice enough kid and no doubt the boy would do well in his old house.
As they left the store *Hagrid checked his list. "Just your wand left- oh yeah, and I still haven't got yeh a birthday present."
Harry blushed. "You don't have to-"
"I know I don't have to. Tell yeh what, I'll get yer animal, not a toad, toads went out of fashion years ago, yeh'd be laughed at-and I don't like cats, they make me sneeze. I'll get yer an owl. All the kids want owls, they're dead useful, carry yer mail an everythin'."*
Harry looked at his aunt her lips were pursed. She didn't like animals he knew.
Petunia looked at Harry's pleading green eyes "You'll keep it and its things clean no smell and no noise and only in your room, understood?"
"Yes ma'am."
"And Harry, no movie for your birthday this year."