If you are willing to pay the HazMat fee (and assuming I can ship them legally, and I haven't checked on this yet) I will buy them for you and ship them to you. No charge at all on my end, you pay actual price for primers and shipping.
Unless you are haz-mat certified, then you cannot ship primers (or powder) to anyone even if you are willing to pay the extra $20. From what I recall, you really don't want to get caught trying to ship haz-mat. DOT takes a very dim view of that.
Loaded ammo is different. Anyone can ship that by ground with either UPS or Fedex and there are no extra costs. The outside of the package does have to be marked "ORM-D" and "cartridges, small arms". I've done it several times. Loaded ammo is much safer to transport than bulk powder or primers.