That stinks when you get a good food lined up and then all of a sudden the store's distributor stops carrying the line! I was all set to try a Pinnacle product when my dog's allergies were acting up and that happened to me. The store was willing to buy a whole case and just let me try a couple of cans to see how it worked out, but it never happened due to the line getting dropped. (We are somewhat rural so off a lot of distribution routes.)
If you are sure that the Addiction will work out for you, I think they do mail order and maybe even with shipping costs, it would not be more that buying by the can.
They have an online store at addictionfoods.com, but I did note they do not sell to NY state, for some reason, so hope you're not there.