These come from a variety of sources on Twitter as well as our Japan correspondant Matt, who took pictures of all sides of Skull's box. He was ¥3,530 ($34.43) at retail.
Enjoy!
Update
Matt also got us pictures of the comic inside and has given us a quick note on Skull(smasher's) stability:
Doesn't have any problem standing. He has fairly tight joints. The cockpit is that same soft plastic as the Hasbro version.