These have been turning up a great deal on Ebay recently...there's also a bootleg of Siren that's very cool.  Instead of shelling out hundreds for a Minerva i just bought this bootleg for $25...Don't let the price fool you, the item is made of high quality plastic, has a sticker sheet, all weapons and an extra sword, and isn't colored too badly.

Pictures from the seller, not too shabby eh? The box art for this figure is also good

Comparisons with my Nightbeat..keep in mind my Nightbeat has no helmet or little guns so thats why the head looks funnier