I'm on CL almost as much as I'm on here, a lot. Sacramento CL see's it's fair share of goodies but they are still pricey. I have seen adaptors with a crawler case going for like $300 but most of them end up being forward shift.
But, CL and the "For Sale" forum is where I do all my shopping.
Yeah, people always ask more than they'll take sometimes not but most times they will. The dual set up I got was for a forward shift. When I pulled the topshift cover off it already had the key stock welder on the shift fork. I knocked the roll pin out of the slid the shift rod forward after some measuring and cut it off. works great.
I did have High Angle build my shafts front and rear both are balanced. but you can save coin by running a square shaft in front.
I have a 4rnr and had seen/read about running a cv shaft in the rear to keep it highway speeds possible. So I had to rotate the axle so the pinion points to the t-case output. This is the part that really intimidated, but it really wasn't bad at all. May welds aren't the prettyest but I've been lucky and had friend to spend the time to teach me, I've enjoyed learning and doing it. But I bet that you could find someone in your area to hook you up with that part.