The alternative is to go to a gun show and pay exorbitant prices (like > $70/brick of 500). Or, have friends (as I do) who are willing to sell you a brick once in awhile.
Sometimes, you can catch some online; use GunBot to look for it; I see right now there is some available for 20¢/round or less. Not too bad these days, but of course we remember buying bricks of 500 for $10.