Even if you DIY it like I did its not cheap if you do it right. I am running delirin pivot bushings, heim joint ends on the connecting rods, about 8 feet of DOM tubing, weld washers, and the plate steel for the cantilever arms.
I have probably 600 in it now not counting the scrap plate I used for the arms, and the shocks. That said it rides great and I kept my bed. I also left room to install the dominator bags I have to keep the saggy g57s off the concrete.
I set the whole thing up to use a 10 inch shock and limit out right at 14" of total travel (which is more than the wheeler's off road extended travel rear brake line will do). When I get a few minutes in the next week or so I will post pictures.
Sean