www.waterville.com/nordic/fatbikes.html has them for rent at the WV cross country ski store for use on their groomed xc trail system, and they have fat tire bike tours led by an instructor. Something new this year.
About a month ago, saw a brite yellow, fat tire bicycle for sale at the Plymouth Wal-Mart, made of aluminum, and looking to be very well made for about $239, which is a lot of money for a bicycle sold at Wal-Mart. I tried it out in the store but it was a bit of a too small a frame for me. At $239, it sure seemed like a great steal-of-a-deal, considering that it was welded aluminum frame with disc brakes, and very well constructed.
Saw an older guy in the Meredith Hannaford about a month ago who had a small gasoline engine powered fat tire bike, and he had very recently suffered a pretty severe bloody, torn-up face and head lacerations injury probably from riding the fat tire gas bike on the paved roads in Meredith...as I had seen it driving the roads prior to this...one look at him was tough to see...very unusual to see someone so beat up like that at the super-market....probably 60-65 years age.... and probably not wearing a helmet with a front face protection...oh well....tough luck....and wish him a strong recovery!