Riverside Motor Court - 10 minutes from the pits on Access Hwy 89.
Mom and Pop place. Very simple and basic. My room was small, but CLEAN! No pool, no room service, no bathtub (had a shower), and no air conditioner. You can part right at your door and they have a huge selection of TV channels, my room had a new TV. They charge by the number in your party, I was by myself. My total cost for 3 nights was $121.65 ... I've stayed in places not as clean that charged that much for 1 night.
I say if you are on a tight budget and like staying near the track, bring your fan to put in the window. But get your reservations in early, they only have a handful of rooms.