Buyee have recently added Mercari Japan to the list of e-commerce companies from whom they will buy as your proxy. There a whole bunch of other proxy agents that deal with Mercari Japan (Just Google "Mercari Japan Proxy"), but from a quick look I've never heard of any of them.
Whenever I'm using Google Image Search with Japanese text to research Plarail and related items, a lot of things on Mercari do come up, along with those on Yahoo! Auctions, Aucfan (an auction market search and price comparison site), and Aucfree (which I suspect to be similar to Aucfan, but is geo-blocked, you'll need a VPN to see it.).
Whenever I'm using Google Image Search with Japanese text to research Plarail and related items, a lot of things on Mercari do come up, along with those on Yahoo! Auctions, Aucfan (an auction market search and price comparison site), and Aucfree (which I suspect to be similar to Aucfan, but is geo-blocked, you'll need a VPN to see it.).
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