Louisiana (updated January 14, 2020)

All the way through 2015, Harrah's New Orleans was the best option to earn tier credits cheaply. Sadly, 2016 was met with a massive degradation of paytables.

If you still want to play here, this is really your only option, which isn't very good:

25-15-9-4-4 Deuces Wild ("LV Airport Deuces") $5/credit 1-play (98.91% return). 8 machines located near poker room. There's also $1 3/5/10 play in the high limit room.
Average loss getting to Diamond: $545
Average loss getting to Seven Stars: $5450



Elsewhere in the state, you're a bit better off at Horseshoe Bossier City:

8-5 Bonus Poker $5/credit, 3/5 play (99.17% return), minimum $75 per hand. Located in the high limit room.
Average loss getting to Diamond: $415
Average loss getting to Seven Stars: $4150

8-5 Bonus Poker $1/credit, 50-play (99.17% return), minimum $40 per hand (8 hands mininum). Located in the high limit room.
Average loss getting to Diamond: $415
Average loss getting to Seven Stars: $4150

10-7-5 Double Bonus Poker $5/credit, 3/5 play (99.17% return), minimum $75 per hand. Located in the high limit room.
Average loss getting to Diamond: $415
Average loss getting to Seven Stars: $4150