The album is being released on A-Zap in Japan, Revolver USA in the US of A, and Forte in the UK. So you should be able to find it in stores if not online.
Melt Banana webpage: http://www.geocities.jp/azaplink/mb/mxbx.html
You can like them on Facebook: https://www.facebook.com/pages/Melt-Banana/192954987398661
Follow them on Twitter: https://twitter.com/melt_banana/