go to
www.jeepforum.com and post up in the wanted section. or stop by a local 4wd store, or find a local jeep club. youd be suprised at the number of YJ owners that just want the springs out of their way and are willing to give away or sell their stock springs...
i have never paid a whole lot for YJ springs (most sets are given to me).
i have 2 pairs of rear CJ springs if you want em. they have the same dimensions as YJ springs, only not quite as much arc... i will take $150 shipped for them.