- For over twenty years HIGH PLAINS SHEEPSKIN has built a strong customer base one person at a time. Gary spends the Montana spring and summer building the thousands of pairs of slippers that High Plains ships to it's many customers around the U.S. and Canada. Formerly in Laramie, Wyoming, then on Last Chance Gulch in Helena. We still make 'em one at a time; we like working with our hands.www.hpsheepskin.com