As mentioned before, production of this figure is limited to just 300, and 20 of them were already sold at Wonder Festival 2010 [Summer].
Another 200 units will be reserved for Yamato Fan Club. Pre-order has started since July 26th on Yamato Online Shop, and will end on August 5th. Late August release, 24,990 Yen (inclusive of tax).
The last 80 units will be for Yamato Online Shop - 50 through Yamato's website itself, another 30 through the Yahoo! online store of Yamato Online Shop. Pre-order will start on September 1st. Release date TBA, 24,990 Yen (inclusive of tax).
Images are from Yamato and Yamato's Developer Blog.