M2 ball is available. Quality .303 Brit surplus is a rare find, most you see now days is POF and not the most reliable. .30 Carbine is around if you don't mind paying for it. 8mm is around but not at the .10 a round it was just a year ago.
You can always find 03A3's and A4's. I don't think there is going to be a big increase in fire arm prices but I do anticipate a increase in ammo prices. There is going to be a run on all calibers.