Kudos to user Tux for pointing these out to us.
First we have a Sky Kid prototype. A great little game to begin with and it would be nice to see if there’s any differences between this and the final version.
Next there’s a really interesting pirate cart, M.C Mario.
Game looks unique too, not a crappy hack. Looks to be a Sprite hack of M.C Kids (thanks to xmrblondex for pointing this out).
Both are starting off at only a buck, no reserve.