One option to get a cheap but decent saddle is to visit your local high-end reasonable-volume-of-sales bike store. Round here there are a couple of places that have a bin for all the take-off saddles from road bikes that people have upgrade from or just not wanted.
Some of these seats tend to be pretty decent and comfy. Got one for 15 bones that has a nice gel insert and works pretty damn good for me so far. Won't find anything earth shatteringly great but generally there are some decent ones to be found.
And then you can save up for a Brooks or other damn fine saddle that will last you for a long time.