Road trip!
Just glancing at some of the surrounding USPSA clubs your options would be Pierre, Casper Wy, Greeley CO, and North Platte NE. Greeley has an excellent range and hosts some of the bigger shoots. Sioux Falls may also be an option, they are quite active as well. Don't know about the others.
I live in Omaha and we host 2 matches per month at the Eastern Nebraska Gun Club plus we will hold the 2011 Sectional for Nebraska. Area III will be held at the Heartland shooting park in Grand Island. They also hold numerous matches year round. As an added perk stop by during the week and take a tour of the Hornady plant.