I am busy changing my oil filter and somehow in my haste loosened the gearbox drain plug. Don't I feel stupid at the moment

I see the booklet specifies a DIA Queen ATF SP III.
Which one do you use and is it available at Midas/Autozone? I am stuck out here in the sticks at the moment and those are the only two shops available.
Your guidance, as usual, is much appreciated. Time is a bit of an issue, seeing that I am not close to the shops and it's Friday.
PS: I see, due to my haste AGAIN, I posted in the wrong section.