Key just announced on Twitter that they’ll be selling a downloadable version of 1st beat on DMM! The DL version costs 6,800 yen (excluding tax) while retail copies of 1st beat normally cost 7,500 yen (excluding tax).
I have personally never purchased anything from DMM before, but since they seem to have English support I’m assuming they accept foreign cards as well? If I’m wrong about this, feel free to correct me.