First off, I don't scrapbook. I swap decos and lyrix, which are mini-scrapbook like booklets that pen-pals make, decorate, and swap around the world. But because each signer decorates a page before passing the deco/lyrix on, I use a lot of craft supplies to sign in the swap books I get.
Scrapbook Hideaway has a dizzying selection of ... well, of everything a scrapbooker or crafter could possibly want! They have a wide selection of scrapbook papers (sold individually), hundreds of neat stickers, alphabet sticker sets, cropping tools, ribbons, adhesives, kits, etc. etc. etc. I spent way too much money in the store on my first visit, and came away with a ton of cool stuff.
They also offer classes, from beginner to advanced, and upcoming projects are posted so that you can see what the class will make before you decide to sign up. When no classes are being held, you can use the tables and cropping tools they have for your own projects for free.