Jumbo Popy Grendizer / Goldorak / Goldrake

Hello, I'm looking to buy a Jumbo 24" Grendizer. Preferrably a Popy version (not too hopeful on that front!) but willing to 'settle' for a Mattel Shogun version. If anyone has one or knows of someone looking to sell one, please contact me. I'm new to CollectionDX, so I don't know where to look, other than E-Bay. Any help would be greatly appreciated. Also, any suggestions on what is a fair price to pay would also be appreciated. Thanks in advance, Rodman75