NEED HELP? REAREND BLEW OUT

I blew out the rear end of my Av. I need to replace the gears 4.10's and the limited slip carrier. Does anybody know of a junkyard which has newer vehicles so that I can just replace the whole rear end at a cheaper price or of a store that I can buy the parts at a good price? I will truly appreciate any info. Thanks

P.S. Since my Av is lifted, Chevrolet will not warranty it. In cause you are wondering.