Billings is a heck of a drive from Wheatland. Not sure that it would be worth it for me if the sole intent is Poker. Actually I do not make the drive of 130 miles to just play poker in Billings. The only time I end up playing there is if I am there for some other reason and have time in the evening to play.
If you are looking for mid-high limit games that are available all the time, 24 hours a day, then Montana poker is not that way. If you have another reason to be in Billings then by all means there is live poker available.
If you really want to play like poker from Wheatland WY I would suggest making the Drive up to Deadwood SD or I guess there is some live poker in the mountains west of Denver somewhere.
Deadwood is a shorter drive and the Black Hills are nice. Plus there is more to do, at least with gambling, in Deadwood. They have Blackjack and Slots and all of that sort of thing if you like that stuff at all? Plus Deadwood is just a neat old western town. Devil's Tower is out that way as well and that is a neat place to see too.
Might want to check out the
Poker Wiki for more information on poker in Deadwood. There are a couple of good writeups in there