Buying bulk is the way to go, not just for cost but for the fact that lately some componants can be hard to find on a regular basis. Lately you can hardly find the same brand twice in a row, and that sometimes means fiddling with your loads. It's also best to source locally when you can. Shipping can kill any cost savings you may have made (I just bought 2k 45acp bullets at 65lbs, you really don't want to pay shipping). Same thing with powder and primers. They can't be sent via mail so they get sent via freight. Sometimes you just can't do it, but local is the best way to go.