Google is your friend. Unless you live in a really small place I'm sure you can find a source. You may have to buy in bulk to make it worth the trouble but I'm sure you can find something. You might just have to support Petsmart. I know Petsmart is evil on these forums and we aren't supposed to like them all that but for the health and welfare of your animals you might just have to. I buy once a month from a local breeder and euthanize myself with dry ice. The dry ice costs .60 a pound. Once pound does the trick.