Wait, wait. You're talking about the 6' Heisei Mechagodzilla right? That one was only released in 1998 (with Godzilla Island and Toho Kaiju tags) and 2001 (with a Movie Monster tag). There was never one released for the 50th Anniversary.
To be honest, I'm not sure why you keep referring to a "50th Anniversary" one. Here's the listing for this figure from Club Tokyo...http://clubtokyo.org/listings/itemListi ... tentID=548
And $30..? Eh, you could do worse, but you could do better.