I have 3 of these, the 2 that were available thru the Grump Kickstarter, and the one from the 2013 SDCC. All by artist Beth Sotelo

I have seen an image of a fourth card, that shows the 3 characters in a Mexican mariachi band. Where was this available ?

She had them done at the same time as her kickstarter rewards. They were available at her tables at different conventions at the end of the year. Comikaze & Long Beach Comic-Con if memory serves me right.

I believe she may have turned some of them into magnets as well? She mentioned this but I didn't see any of the magnets in person.