There's no official information about them whatsoever, but it seems that Bandai has released (re-released) HGUC Unicorn Gundam, Unicorn and Destroy Modes, bundled with 1/48 Unicorn Gundam Head Display Base, supposedly the limited prize item for Dengeki Hobby January issue released last year, one for each mode. With Bandai's logo on them, they don't look like pirated.
Not sure about the price though, and the label of "limited" printed on the box - limited for what reason that is. So far I only spotted them on Chinese forums, maybe they are limited for international market, or maybe certain countries only.
Anyhow, I can hear some thunder roaring right after this. ^^;
Images are from Nintendo BBS: Link 1, Link 2 and Xhood.