Shooters outpost usually has a good supply of powder and primers--call before you go.
They had boxes of bullets on the floor, but I wasn't paying attention as to which calibers.
Rileys has powder and primers, but they have 500 primers/1 lb powder limits. On the upside they actually have many flavors in stock.
What bullets, powder, and primer are you looking for specifically?
I'll let you know what I find in my travels.