I am guessing you want a used cage? There are quite a few on Craig's list. Just be sure and ask the seller questions. Bar spacing, condition of the cage (no rust or broken latches and bars), reason for selling (sick bird prior to sale will need thorough disinfecting), etc. Do you know what dimensions you are looking for or price range?
These are a couple I found in Houston area. There are also some great sales on new cages at Petco and Drs Foster and Smith. PetSmart may also be having a sale on some. By the time you find a used one, you can have a new one ordered and delivered.