Mafia 2 & 3 join GOG:
https://www.gog.com/...ia_ii_mafia_iii
Whole franchise is on sale - Mafia 1, Mafia 2, and Mafia 3 (and their DLC's).
They're 50% off each individually or 66% off if you buy them all altogether:
https://www.gog.com/...ial_promo_mafia