It used to be on their home page, but I can never find the link on their mobile site.
http://www.myjapanbrand.com/
Edit: found it, https://www.japanparts.com/sp/forwardingsummary/purchase_service
MyJapanBrand is owned by the same parent company as JapanParts and JapanParts does still have their own buying service as well. I have used both and they were both better than Buyee when it comes to shipping prices. The fact that Buyee is so conventiently linked right on the YJA listing is why I usually use them (or at least their service to watch items).
https://www.japanparts.com/packageforwarding/