Not sure if it's been mentioned but BBTS (US$230) and TFsource (US$250) have it on pre-order coming Sept 2013.

http://tfsource.com/japanese-generat...g23-metroplex/
http://www.bigbadtoystore.com/bbts/p...92&mode=retail

I'm not sure if that's a good price or if there's better avenues of obtaining Metroplex. Just thought I'd share it.