vpFREE2.com says that there are three $1 3/5/10 Play upright machines with the 99.96% 10/6/40 DDB paytable in Poker Plaza (between buffet and All American Grille) ($50 coin-in per tier credit)
Here's a link to that info: https://www.vpfree2.com/casino/rio-all-suite-hotel-casino
