The most common type of rim for the casual Jeeper is a basic black steel rim. I came across an excellent deal on some Cragar Soft 8's. These are 15 x 8 with the Jeep 5 x 4.5 lug pattern. 4 inches of backspacing.
$47.99 per rim with FREE shipping
http://www.jegs.com/i/Cragar/260/3975812/10002/-1
Lug nuts and Center Caps are not included which is the norm, but they can be purchased from JEGS as well.