There is a new MM P1 promo which comes with all orders through the company's website, and also if you pledge towards the new Kickstarter which is ongoing for about another month.

Note that the 3 Spanish language promos from 2017 (one was at the Philly show) were not for Series 3 as originally thought, but were for the separate Heladitos set.

This new card set, which came out in late September, has 3 promos, P1 to P3

These cards were a Kickstarter release, and the people I know who pledged and received packs of the regular cards, also received the 3 promos

As Dave mentioned, I think people who do on line orders, might also be able to get the promos. Not sure.