I farmed out both my SM465 and NP205 at the same time. 375 parts 450 labor 35 tax Total 860. Basically 225 labor for the trans and transfer each. I saved time, I didn't want to dicker with them. But I pulled and reinstalled myself and by myself. I did the clutch and oil pan the weekend they were gone. The big labor money is in pulling them out and putting them back in. If you can't do that, then add another seven hundred to a thousand dollars.
So back to the original question, who is good in your area? If you're not getting an answer to that then start working the phones. You will eventually find someone that gets excited about the old gear boxes, when you do... that's your shop! You've gotten prices from two of us so you will now know what to expect.
Work the phones, talk.
j