a lot of the front buckle ones have pretty (and seamless) backs!
Posts by Asherah Arts (formerly Lee Rose)
oooh, I'm super lazy and use ebay. thousands of things direct from china starting at 72 cents. I'm pretty sure my whole scarf collection cost me under ten dollars. and there is a bunch of other fun stuff, I've gotten some cool tops etc for a positive steal!
other than that....thrift shops are my jam!