Currently here are a couple of my costs:
9 mm, Plated Bulets = $ 7.93/Box of 50 This is with powder at $25/lb, bullets at $12/100 and primers at $25/1000. Brass is excluded.
45 ACP, 230 gr Lead = $ 4.30/box of 50. Bought hard cast bullets for $25/500 at an auction, powder at $20/lb and primers at $25/1000.
28 ga shotshells, 7/8 oz = $4.00/box of 25.
12ga, Hard shot, 1 oz target loads = $ 4.93/Box of 25. This is with hard shot at $45/25lbs, powder at $18/lb and primers at $25/100
You can use the promotional, cheap shotshells for backyard clay shooting. It just depends on what performance level you want to achieve.
Remember this, when ammo prices skyrocketed, I was still loading at these rates and didn't worry about running low. Just so figures to share..