It depends upon how much you buy. Sign up as a preferred buyer and buy yourself a couple of years worth of stuff. Shipping can be a killer also. I but mostly gear oil and ATF. The oil at Walmart is as good or very close to Amsoil. But I believe the ATF and gear oil are much better.
Have a buddy who "hobby" sells Amsol, plus one of the two local Chrysler Dodge Jeep Ram dealers stock a huge variety of Amsol (sponsors the Circle Track, stocks and sells Edelbrock, Kirkey, Mopar Performance, MOROSO, etc).