Contacted Intersport Performance and they said they would just buy a transmission from a dealer.

Local BMW dealer quoted me a remanufactured trans for $6,900 + $2,000 for labor/install/fluids = $8,900.

Superior quoted me $3,800 - $ 4,3000 total to rebuild my trans (TC too) and all labor/install/fluids included. Down time about 3-4 days.

I think I'm going with the rebuild at Superior.