It's only cheaper if you buy in bulk. There is a hazmat fee that sometimes is waived during deals but you usually need to be buying over $150 of powder or primers combined. I like buying in bulk then I don't run dry when I'm doing a bunch of loading.

I can get 4831SC a lot cheaper than that a pond but I'm getting 8 pounds at a time. Then I don't need any more for years! Then I have years to save up for the next jug or two.