If japan has a Nintendo Famicom homebrew scene, news of it doesn't often make it to the west. Whilst you may be familiar with Japan's Dōjin soft, most of these releases seem to be either on modern platforms or classic computers, without much activity on consoles. That makes this music demo a bit of a rare beast and add the fact that it's getting a cartridge release and you've got something pretty special.
Although it was announced a while ago, 8-Bit Power now seems to be available to pre-order on Play Asia, for the not completely unreasonable price of $29.99 or £20.07, with what looks to be very nice retail packaging too.