There are many Wizard's shops located in England, but you need to know the right place to look. In the backroom of a normal muggle Hogsmeade pub, a secret passage leads new students to obtain their supplies. Students and professors alike, enjoy taking time out to shop, eat and be merry.

Diagon Alley:

Eeylops Owl Emporium - A shop that sells birds. Hedwig was bought here.
Florean Fortescue's Ice Cream Parlor - An ice cream shop.
Flourish & Blotts - All the books on the student's book list can be found here.
Gambol & Japes - A joke shop that sells tricks and practical jokes items.
Gringott's Wizarding Bank - A bank run by goblin with top notch security. You'd be crazy to try and break into this bank.
Madam Malkin's Robes for All Occasions - The place to buy Hogwarts school robes.
Magical Menagerie - A wizard pet shop. Crookshanks was bought here.
Ollivander's - The oldest and best wand shop around, and it's also where Harry got his wand.
Quality Quidditch Supplies - Harry's favorite shop in Diagon Alley, which sells quidditch supplies.
Stationary Shop - Next to Quality Quidditch Supplies.
The Apothecary - Potion ingredients can be found here.
The Leaky Cauldron - This pub located in London is a gateway into Diagon Alley from the Muggle world. Rooms are available there, as Harry once stayed there while escaping the Dursleys.

Hogsmeade:

Dervish and Banges - Equipment shop.
Gladrags Wizardwear - A shop that sells many things, among them, strange socks.
Hogsmeade - A localized food and drink court where students love haning out. (think of a 50's diner, except with a more bar like atmosphere.)
Honeydukes sweetshop - A candy store selling not your ordinary sweets. Expect things like Fizzing Whizbees and Acid Pops.
The Hog's Head - Another pub that is rarely mentioned.
The Three Broomsticks - Students love to hang out at this pub to drink butter beer.
Zonko's Joke Shop - The name says it all. A great place for buying tricks, including the infamous dung bombs.

Knockturn Alley

Borgin & Burkes - A shop that sells Dark Arts items that are quite dangerous.