Mississippi (updated January 14, 2020)

Mississippi has seen some downgrading.


Harrah's Gulf Coast in Biloxi features a high-limit 9-6 Jacks or Better game, if you don't mind variance and you can take the fact that it's $25 per tier earned.

9-6 Jacks or Better $5/$10/$25 per credit, 3/5/10 play (minimum $75 per hand), 1 tier earned per $25 wagered, (99.54% return).
Average loss getting to Diamond: $575
Average loss getting to Seven Stars: $5750



Horseshoe Tunica is a little bit more reasonable, though not great:

9-7-5 Double Bonus Poker: $1 or $5 per credit, 1 play. 99.11% return. You'll probably want to play the $5/credit version, or it will take 10 hours to earn 2500 tiers. Note that this is Double Bonus Poker, not Double Double Bonus. These are located in "Game King" machines, in front of the buffet. The paytable is 9 for a full house, 7 for a flush, 5 for a straight, quads at 50/80/160, and 55 for a straight flush. Verify these payouts before playing.
Average loss getting to Diamond: $445
Average loss getting to Seven Stars: $4450

9-6 Double Double Bonus, $1 or $5 per credit, 1-play (98.98% return). You'll probably want to play the $5/credit version, or it will take 10 hours to earn 2500 tiers. These are located in "Game King" machines, in front of the buffet. There are also some bartop versions of this game.
Average loss getting to Diamond: $510
Average loss getting to Seven Stars: $5100