The only poker room in town is the Ameristar Poker room. They play $3/$6 Hold'em w/kill, $5/$10 Hold'em (Monday-Thursday), $6/$12 Hold'em (Friday-Sunday), and either a $10/$20, $15/$30, or $20/$40 Hold'em game and the occassional Omaha game. The limits on the Omaha game depends on what the table feels like playing that day and it sometimes is Hi/Low (the same 20 people are always playing Omaha.)
They do not play any no limit but occassionally have a pot limit Omaha game going.
Beware, Missouri has some goofy laws that only allows you to buy in with $500 every 2 hours. Most players color up to black chips and take those home with them to get aroud this rule. If you are going to play in the bigger games, get there 2 or 4 hours early so you can buy at least $1000 worth of chips. Most of the guys that play the $15/$30 and up have a few thousand dollars worth of chips with them.
Also, be prepared to wait up to 5 hours for a table on the weekend afternoons and evenings and up to 2 hours on the weekday after 4:00. The best times to go are before 8:00 AM on Saturday and Sunday and before 4:00 PM Monday - Thursday. The waits are ususally less than 30 minutes at these times.