You can make your own. A friend of mine wanted one and he kept his eye on craigslist and other online places. He has a 48" John Deere 2 stage blower that is practically brand new and paid just a few hundred for it. He then found a 13hp Honda engine for about 600 I believe. He built his own framework based on the units on youtube and all over the net. He has it on a Rancher 400at and is raised and lowered with the winch like one you would buy. He has less than $1000 into the whole blower unit and he said it works very well with the exception that he needs chains on the fourwheeler for pushing into the hard snow.
06 Rancher, Plow, Warn winch(too small) Mud Lites.