The new transmission is in and done! I know I haven't updated in awhile so you might not even have been aware this was in the works. The short of the story is, I found a company - Smart Parts Auto - that sells rebuilt transmissions.
The price was good $745 plus shipping. Fastlane did a nice quick job on the install and were flexible with working with me using Smart Parts to ship directly to them. The install price was very fair, even though they broke my window post. I had to drive back with the windows off, but Tom came out and re-welded it shortly after.
With Tom's Imperial in working order, the truck is once again back in my possession. Just in time for the crappy rainy week.