If you're into psychological gymnastics you might have fun doing this: Every time you load up a box of .45 Colt go online and check the price at one of the reputable dealers (Midway, Brownells, Palmetto State etc.) keep a running tab and congratulate yourself on how much you've saved.
A friend of mine showed me how to do this and another trick---if you're concerned about the price you paid for a firearm is to consider that if you take good care of the gun (and of course you will) the gun will last almost forever. So take the price of the gun, divide it by darn near infinity and you've got the price per year the gun is costing you which is practically nothing. Disclaimer: Close family members of mine have at times disagreed with this rationalization.