I love Birthday Express! I first became aware of them through their catalog but was pleased to find out that they are located not too far from me in Kirkland.
When I first walked through their doors I was shocked. They have a lot more going for them than most birthday/party shops and everything is at pretty good prices! In their catalog and on their website, they offer packs but in the store, you can make your own theme packs and buy everything in the quantities that you need.
They have tons of fun gift bag toys and so many neat craft kits that it is hard to walk out without a lot more than what you need. They also have all the popular children's theme party goods as well as nicer gift items and really neat costumes.
I love going there when they are having a sale. Last time, I bought gorgeous well made fairy costumes for all my daughters at excellent prices. These weren't the cheapo costumes either. Absolutely gorgeous and well worth the drive.
If you need fun items and ideas for a party, Birthday Express is the way to go!