I haven't seen one of these on eBay in quite some time (> 1 year). TCR20 says $100-124. Between that and the somewhat uncommon nature of these, the price might be more than your guess.
Good luck with the search. These are sexy beasts that I patterned the $100 chip in my Arizona Club custom set after.
Saw a post a few weeks back on a newer member looking for the obvious T500, T1000 and T5000. They were able to secure a T1000 very quickly...so I assumed maybe there were a few out there. PM if you feel my pricing is off.