I wish I knew a place for you, man. The best I can offer is the Japanese name for the line, 'my dearestピカチュウ' (that's what's written on all the packaging of the related products, with the my dearest part in English.) You can use that to try and poke around some Japanese sites. There's nothing on Yahoo Japan Auctions, and I don't know any others to check, but maybe someone else does. Then you could use a deputy service to make the purchase.