This deal has been going on and off, but I think it's notable that Orbital and Coloris are now back in stock (after a very long time out of stock), so you can get all of the GBA Bit Generations games for $14.90 at Play-Asia again. If you look at the descriptions of each, many times they'll let you add 2 of the games to your cart together for $1 off the combined total. (I just bought Orbital and Coloris together and the combo let me add Orbital for $13.90, for example)
http://www.play-asia.com/paOS-19-49-en-15-bit+generations.html
Orbital and Coloris went out of stock very fast last time they went on sale!
http://www.play-asia.com/paOS-19-49-en-15-bit+generations.html
Orbital and Coloris went out of stock very fast last time they went on sale!