I don't know what to tell you except you can definitely find a better deal. What's in the future plans for this Jeep? Knowing that would help narrow down your search and help you find the best deal. TJs came in quite a few configuration so it helps to know your plans for the Jeep you're buying to figure out if you're getting the best deal.
For example, if you're planning on 37"+ tires than it would definitely be too much to pay 15K for since you would need to replace axles. The particular X model you're looking at has a rear D35 which you might get away with on 33's (for looks, no high wheel speed in Florida mud)... or say you want to go yo to 35's and feel comfortable wheeling then you would look for one with a dana 44 rear and the options you will like ( not too many creature comforts in a TJ). And so on...
Rokmen TT, Rokmen control arms, Novak NV241 cable shifter, JKS 1.25" BL + 1" MML.
Anybody can take advice if it doesn't interfere with their plan.
RIP "Prescott 19" Prescott Fire Department