Possibly a few on here for sale, seen a few old skool ones on here today but sure you might find a more comp style one. If you find a 2nd hand one with good spec just means you can justify spending the money on something that your quite likely to wreck, good luck with finding a bike bro hope you can get out and ride before the good old Brittish weather changes again!
Edit that, Your a Yank. Lucky bugger When it comes to Dollars i'm not sure whats cheep, would this be in your price range? http://www.ebay.com/itm/USED-Woodman-Trials-Bike-26-Wheels-Chris-King-Bonz-/300611288869?pt=Mountain_Bikes&hash=item45fdd43f25 if not there are other bikes on ebay that are much cheeper.