I was wondering if there were card sleeves for the darkness deck and mini bosses besides the myth flame backed ones that are offered on Megacon's site? Also what size sleeves do I need if I decide to not go with those? I tried some FFG ones I had laying around and the cards were too wide.
No, those are the ones for most of the cards outside the hero decks. Myth flame logos abound.
Here's a great geek list for sleeves. Direct link to Myth content