Digging into my ammo stash, I "rediscovered" some 9mm ammo bought in 1961. Price tags on the 100 round boxes were $6.00. However, that $6.00 in 1961 would now be $55.78 today. Given the ammo is basically range ammo, I know I can buy 100 rounds for less than .55 cents per round.
Interesting.