Eh, I've done a lot of looking for the same deal, and the best I've found is either buying large amounts in the store (at 2.09 a can x 24 = 50.16 + $3 tax = 53.16), or getting it shipped for $53 from their site. They accept Paypal so if you were to come across some sort of deal or promotion for that, although I haven't found one (aside from doing stuff on Cashlagoon for Paypal $), then the cost gets a little less harsh.
In any case, good luck with your search.