If you have two working keys, you can get a blank with a transponder on eBay for $11 or so. Then with two working keys, you can program it yourself. You just need to find a locksmith or a store to cut the key and your golden.
2008 Jeep JK X: auto trans, 3.73 gears, D44 rear, D30 front
Mods: 2'' Rusty's coil lift, Superchips 93 octane tune, Cobra 75 CB radio, 33'' Duratrac's, onboard air compressor
My Build Thread! ---> http://www.jeepforum.com/forum/f96/dronacs-build-thread-1104134/