I ran into this issue with the high price and limited availability of a wide variety of transmission fluids in this area a few years ago. Luckily, when Pep Boys decided to stop selling auto parts and transition to just servicing cars, I bought several cases of old school Type F and Dextron transmission fluids for dirt cheap, since they wanted to liquidate inventory. They were getting rid of cases of their house brands of transmission fluid for a little more than a dollar a quart.