I have one in NE Illinois for $200. Came from a rollover '89 K2500 light duty I parted out. 3.73, SF 14 bolt, 6 lug. Complete but rusty. Don't know anything about the axle other than it turns freely and I drove it on and off the trailer before I hacked it up.
I also have the matching IFS front diff if you need it.
I get pretty good shipping rates through Overnite Transportation if there's a dock near you.
Send me an email if interested. I think I have pics of it already.