Looking for inexpensive new costumes? Buycostumes.com has some really AMAZING deals. Right now they also are offering up 5 deals for under $5 every day M-F, including adult costumes too! They do sell out fairly quickly sometimes, so make sure and check first thing every morning until you find one you love!
Also, check the clearance section. Today I noticed that this cute Monkey costume is only $9.99..so cute!