Two Guys Flyshop in Lafayette used to stock them...but you might want to call first, its been awhile since ive seen any. Also try Front Range Anglers in Boulder and St Vrain Anglers in Longmont. If you are not near any of these get out a phonebook and start calling around. They are actually fairly easy flies to tie if i remember, kind of like a large Hare's Ear with a soft partridge hackle underbody for legs and longer tail of either marabou or squirrel tail...