I'd say search ebay first, I picked up a set of 35x12.50r15 maxxis bighorns for $600 a set on there. With a little patience you can usually find really good deals.
On
[Only Registered Users Can See LinksClick Here To Register] , they have the toyo proxes 4 for 104.67 and 120.40 for the sizes you want. I've ordered from them before, had no troubles.
That should give you an idea of what to be willing to pay online.
Those wheels look good, and not a bad price IMHO.
onlinetires.com cheapest out thier for tires and shipping plus great service