Op,
If I were you I would take this offer up and buy a box. It should last you some time.
Go to the hodgdon burn rate chart and find a powder within the prc case range that is less popular, they exist and can be found
For example something like norma mrp. There are quite a few.
you need to be flexible on bullets right now, there are plenty of great 6.5mm bullets out there.
for primers, I watch them pretty hard and they do come in stock but go out fast. If I see any in stock I'll try to post them here