I won't ever buy tires from a dealer. WAY over priced. Shop online for them. Great deals and usually with free shipping. Many tire shops will mount them for you (i have even seen that walmart will if they are not on the atv when you bring them in). Try bikebandit.com or rockymountainatv.com. I have boughtt ires from both and got the best deal i could. Free shipping form both too.
2006 Sportsman 500 efi, Polaris 3500 Winch, uni Filter, Oary Grips,Maxxis Bighorns, 2" lift, Brush Guard, Bark Busters