Party City

The Wal-Mart of party shops. Party City has a variety of cheap costumes for all ages—and even a small selection for the dog. They’re better known for carrying a crapload of paper party supplies, from gift bags and decorative plates and napkins to spooky spider decorations and helium balloons galore. It’s not the most inspiring store, but you’re never far from one. Check the website for Party City locations near you.