I have a Rock Krawler 3.5" Mid-Arm Flex lift kit that I pulled from my JK before I just traded it. I had only 11,000 miles on my Jeep at the time.
Price is $800. Not included with the lift are the brake lines ($100), rear trackbar bracket ($70), and sway bar links ($100).
I will throw in 1" front bump stops and 2" rear bump stops.