Have you considered ordering surplus HXP M2 Ball from the CMP?  There's tons of it out there, and at around $120 for an ammo can of 200 rounds, the price is pretty great!  It's Greek made, non-corrosive, easily reloaded, and very accurate in the Garands too!  Also, if you ever venture out to Camp Perry for Nationals Week... there's a vender who sells pulled mil-surp bullets by the pound.  This guy usually has M2, AP, and even tracer bullets for the 5.56mm, 7.62x51mm, .30-06, and more!