if flying in to Denver try these guys http://extremesnowmobilerentals.com/rentals.html
they also rent trucks for about 135 a day and free trailers so u can drive your sled to where u want.
best bargain in the west u and a bud fly in to Denver they pick u up u get a ram 4 door for 125 a day a 2 or 4 place trailer free and a 5 day rental for under 700 or long weekend deal 450 for a m8.We rented there along time ago. You will not get a better deal on sleds in Colorado.