I recently asked a similar question in another thread. Check out some of the suggestions there. I ended up with the Fitness Reality 810xlt. About $200 total.
This is a good call. As long as you double-check that the piece is in good condition, keeping an eye on Craigslist isn't a bad idea. Plenty of people toss out fitness equipment often enough. ... ha, on a whim, I just checked my local Craigslist and @Vincepac1500's suggestion came up in the search.