Just picked up the limited box from a shop in northern Japan. This city has a population of ~107,000, and there were three or four other pre-orders and then seven boxes of the thing beneath those. I don't think it will be that hard to find. I paid 6,174 yen, the equivalent of about $80 in today's American monopoly money.
The box is gorgeous, as is the little art book (fuckin' awesome, lots of pencil sketches an interview and shots of the teams library and office, etc...). The manual for ICO is cool but the manual for Wander is incredibly cool. I want to check whether it supports english so if I have time (not sure, bit busy tonight) I'll try to take a few pictures to share.