Hehe, as a fellow college student I feel your pain! My birds are the one thing I don't skimp on - I'll eat ramen all week long, but god forbid they not get a new toy when I go to the pet store!
I personally like
Bird Cages 4 Less - Bird Cages, Aviaries - Free Shipping. Ebay is pretty good too, but make sure you check the shipping costs first! And keep checking craigslist - that's where my two cages came from, and it saved me a TON of money (which I promptly spent on a bazillion toys and treats).
Good luck!