The majority of OK casinos are slots only, but there are still a few dozen that have tables, and some of those have roulette. I've been to a few that have roulette, and those have own roulette chips.

For example, Choctaw in Durant has roulette chips, and they are listed in ChipGuide. The Choctaw in Grant has their own roulette chips, but they are not in ChipGuide; they look like the ones for Choctaw Durant, but say "Grant" on them.

Winstar in Thackerville has their own roulette chips as well -- also not in ChipGuide.

I seldom play roulette ("Sorry!"), so I have never tried to harvest the chips.