Yeah, U.S. and European sellers tend to overprice Japanese cards. Especially Ebay sellers
This is probably because they have no idea of what the market looks like in Japan and what the market looks like elsewhere.
I often use a Japanese site that sells Japanese Pokemon Cards (SINGLES ONLY). They ship internationally but I wouldn’t recommend it since Japanese EMS is crazy expensive.
www.chanploo.com/?mode=cate&cbid=1532493&csid=43
But if you know somebody who lives in Japan you can ask them to get it? Well thats up to you.
(the prices are in JPY)