I like dealing with featherfarm.com for certain cage types (and all our big cockatoo nest boxes.). Prices are average, cage quality is excellent, and they're honest.
Now, if I were just looking for an average cage I would find a breeder to do that for you... (I have a business license and I don't pay retail prices for cages most of the time). You can often get in touch with a breeder or cage merchandiser at a local bird show.