Streets of Willow has one, but they're probably at least a good 2 hours from you.

Skidpads are generally big, with a diameter of 200 or 300ft.

Come to think of it, see if the CHP will let you use the San Bernardino EVOC facility. I'm pretty sure they have skidpads. Also, the San Diego Police Deparment sets up an autocross course to teach vehicle dynamics. They sometimes have a small (100ft diameter I think) skidpad. It's in the parking lot of Miramar Community College in San Diego.