We stayed at Bordertown Casino in Nov 2007. It is on the Oklahoma side of town of Seneca, MO. They have RV parking in a lot across the street from the front of the Casino. Registration is inside Casino. First night is $15 then next two nights are free. The fourth night is higher and there is a limit but I don't recall the amount of time but thinking a week but may be two.
We also received a buy one get one free meal for the restaurant. We redeemed this at the evening buffet and it was terrible. Thinking they couldn't ruin a breakfast buffet, we went back on in the morning only to be proofed wrong. They did have menu's but we never ordered off menu.
This is back-in FHU. Hook ups are in a strip down the center and units back up to them on both sides. The dump was too far back for us to hook up after we were parked without a lot of sewer hose. They did have very good shuttle service from door of unit but it wouldn't have been a long walk. The casino it's self was very busy and they had a large Bingo hall.