As of January 2015, Sigma Derby is still at MGM Grand. My favorite casino game. I guess they are disappearing because they run on quarters. At any rate, all the seats were taken except one that didn't work -- the quarters would just run through it instead of sticking. After a few minutes a different seat opened up and I hit several quinellas, including a 20-1, before eventually running out of quarters, as does happen in Las Vegas from time to time.