This should be a great start for you. I know that some of the people we play our home game with say that Tailgaters usually has a pretty good turn out. They have cash prizes and maybe a $5 buy in if anything. Not real big money stuff but fun none the less.
I used to play at those places a lot when the WPT Amatuer leage was around, but they are no longer in KC.
But obviously the casinos have assorted buy in tournaments every week and almost every day if you aren't picky about the location. Doesn't the Prairie Band casino have poker? They would probably be closer to you.