Radioactive Press has Monster Mash now available for download.
From their announcement:
Our latest Toy Battle System game Monster Mash is now available!
Monster Mash is a turn based combat game for two or more players set in a world where kids can buy designer monsters as pets and have them fight each other in a global sports league. The game allows players to create and control one of several different types of miniature monsters. Monster Mash gives players complete control over the creation of their monster. Players can create an existing monster from popular media or one from their own imagination. The possibilities are endless. The object of the game is to beat any monsters that oppose you in the arena and win the match.
Monster Mash is a standalone game that can also be used as an expansion for any other Toy Battle System™ game.
Available at RPGNow and Wargame Vault.