My 98 TJ has the 2 button 'Chrysler Logo' fob, and only came with one of them.
I bought a second hand one off of Ebay and got it reprogrammed at Marshall Jeep @ Cambridge. Wasn't cheap mind, and my local dealer (Peterborough) refused to guarantee it would actually work afterwards (hence the trip to Cambridge)
Have since found out that Steve @ FTE has a device to re-programme the fobs so he would be my first port of call if you want to get a replacement fob programmed. He may even be able to source a cheaper fob for you...??