You are being taken advantage of, there is not 8 hrs work in it, if it takes a qualified mechanic to undo 13 bolts and press out 6 bushes and a ball joint , hes not a mechanics bumhole, maybe 2hr in total, and that was me scrambling around under the car by myself and making my own press for removing and installing the new bushes, having never done it before, amazes me how some mechanics feel so guilt free when they blantly lie directly to the face of somebody and rip them off, and as other have said, parts can be sourced for 200-500 delivered depending on exacly how many bushes you are replacing, If you only need the rear lower arm to axle, the good ones are these
http://www.jeep4x4center.com/mopar-r...29094aa-m.html
you need two,
if you also need/want to change the arm to body these.
http://www.jeep4x4center.com/mopar-r...28864aa-m.html
But if you do that, it actually cheaper to just purchase the entire arms complete, that way there is no fitting charges to pressing out the old ones and pressing in the new ones, only 4 bolts and 15mins work to swap over each - no special tools required
http://www.jeep4x4center.com/mopar-l...28866aa-m.html
Same for the upper arm, IF the bushes are dead, these are the replacements
http://www.jeep4x4center.com/mopar-u...2088425-m.html
again, IF they are buggered the ball joint will probably be too, so sometimes easier to swap out with an entire new one, so fitting only takes 30mins to an hour if its a bit stuck
you can get a whole one from here
http://jeepinbyal.com/jeep-liberty-k...ear-upper.html
NB - you can also get a "street" version of the parts from Morris 4x4 they are cheaper, see parts list here
http://www.jeep4x4center.com/jeep-st...liberty-kj.htm
but I strongly suggest you go for the Mopar brand