Another option, when I go to Walmart, I buy what they have...45, .223, 9mm
Then I put it on local forums, Facebook etc looking to trade. I just traded 100 rds of 45, 200 of 9mm and 300 of .223 at a total cost to me of 203.51 tax included, for 2,500 rds of .22 lr. Basically a final cost of .081 per rd. sometimes you gotta get creative.