Found one
RAVENOL J1C1003 SAE 75W Manual Transmission Fluid - MTF-3 Full Synthetic (1 Liter)
https://www.amazon.com/gp/product/B00QPCL7ZE/
Since we need 2.4 quarts, we probably need to buy 3 bottles.
Reviews are all good, the fluid is full synthetic and German made, so it should be at least as good as Toyota OEM fluid, but I expect it to be better.
I am thinking about changing mine as well. Toyota is very vague on the manual transmission fluid type, our car owner's manual says SAE 75W. After spending a few hours researching the subject, I found this on Amazon:
RAVENOL J1C1003 SAE 75W Manual Transmission Fluid - MTF-3 Full Synthetic (1 Liter)
https://www.amazon.com/gp/product/B00QPCL7ZE/
Since we need 2.4 quarts, we probably need to buy 3 bottles.
Reviews are all good, the fluid is full synthetic and German made, so it should be at least as good as Toyota OEM fluid, but I expect it to be better.