Chumba Casino has a fairly new progressive game called Big Goreela that has a 3-tier jackpot system. The mini is 40x bet, major 1000x, and the Grand is a progressive that seeds at $30k.
The wins are random and can be won with as little as a 50-cent bet (and has been for a Grand jackpot of around $60k I believe). I've seen it climb as high as $133k, though.
Any way this can be tracked?