Here in the midwest, you can go to most gunshows and buy cans in great/new condition for .30 - $5 -$6 , .50 $8-$10., SAW cans $10. -&!2 and 20mm $15. -$20. The only problem with the 20mm cans is that when they are full ,they gain wt. the longer they set. I know this from experience as when I put them on the shelf it was not to bad , but now , a number of years later, I can hardly move them. The other thing to do is go together with friends and make a quantity buy. Most dealers will cut you a better price when you buy 20 to 40 cans at a time and you can always use them for other things besides ammo.