not much help im afraid, but for visibility I just wanted to add that when my auto gearbox gave up, I had it rebuilt, using BMW parts from a reputable gearbox specialist here in London. I paid £1450 which is around $2300 USD. I did have quotes to the equivalent of $3300 or so USD too. I suggest you shop around to see if indeed there is anyone USA based that does the re-condition service for a keener price. That said, the job is complex and involved, so you won't find anything like $1100 or something to do this job.
To me, the job was worth it at the time it happened. My car is ex police so for it to last till 172K miles was good considering the amount of punishment police vehicles go through. The car at the time it happened was just 3.5 years or so old so I got it so cheap that even with the cost of the gearbox rebuild, I still had an utter bargain of a car.
To you, only you can tell if the job is worth doing or if it means to part the car out. Parting out the easy bits isn't too bad as all you need to do is loosen and remove, but for the bigger oily bits it's down to your skill levels and of course time and space.