The yearly run on N320 has started, so the best of luck to you if that's your powder of choice.
I fortunately know someone who buys in 100# lots, and managed to snag 8 pounds before he left on vacation for the next month. Finding a local stocking dealer is definitely your best bet.
Check on your other components as well. I had to cajole MG for a few cases of my boolits, and weaseled into a deal to get my primers at a decent price as well.