All anyone can say is shop around on the web taking into account shippind and call around to local places. I have bought tires and wheels from seperate places and had them mounted and balanced elsewhere based on cost. There are lots of sources for tires and rims on the web. (Google is your friend)
I don't know what sizes you are looking at but be aware that places like Sears, Sams and others are starting policies that they will not mount (on the vehicle) tires other than the factory sizes.
2003 TJ, 33" BFG AT, 2" BL, 2" BDS spring lift, Truck Lite headlights, Homemade sunrider top.