I got a CycleOps fluid trainer on Ebay for $100 last year. Quite a score. Check Ebay and Craig's List, and even Freecycle - you may get lucky. They had not spelled it right at Ebay, so it did not show up on all the searches, so try to keep your search terms more generic - you'll get more hits.

Now if only I can make myself actually USE the thing! LOL.