Shipping via UPS seems to cost a lot more for us individuals compared to what the commercial rates are. The best deal is still to find an online store with free shipping or low fixed shipping (eg. $5.) For example I sold 1k 45ACP rounds to someone and shipping was $35, weight was over 50 lbs. I would never pay that when buying online.
Thanks for the info anyway OP, many people probably haven't tried shipping ammo before and it's a useful option.