Echoing some of the actual helpful advice given, rather than jumping on the "LOL YOU DON'T WANT TO MORTGAGE YOUR HOUSE FOR THIS, too bad loser!" crap.
If you wanted to commission one of these initially, you would have been paying upwards of $800, which is what was quoted to me by Imaresqd1 himself. Therefore, yeah...you'll probably end up paying well over that if you find someone willing to sell.
I'm not sure about the status of MonkeyRobotMaster's laughing sculpt anymore, as he made the initial run and then probably moved on to other things. They ran about $120 or so, and you can see mine here.
They both have their pros and cons, but considering the insane price difference, MRM's sculpt is more than worth tracking down. There are things I prefer about it over Adam's sculpt, and I honestly consider it to be the better value. There were also a lot more made so it would be easier to track down. Hope this helped.
wow looks like some pics i saw turned me off to this sculpt but those pics are great