I'd go for premiumbeat.com- they have extensive sound fx packs and some good music. They do keep pushing up the prices- but all the music is the same price and most of the music also has looping versions available.
I know that a lot of people would actually actively avoid the sandbox because many consumers would believe that sandbox means the genre rather than a place to discover new games. I know I was confused a bit at first.
So would the blender player be a seperate download on the ouya store and then someone would download a game made with the software and then open and play it with the blenderplayer to preserve the differences in each license?