>>6296185>>6296924Yahoo Japan Auction. When browsing items there's a banner at the top which says you can bid on them through their Buyee service.
I bought a SPEC Eva through Buyee this week. Besides the actual ammount you bid (in my case 2500 yen) there's a Service Fee (150 yen), a Payment Fee (200 yen) and optional insurance (500 yen to check the stuff you bought on YJA is what they receive) which I opted out of since poorfag. Then when they get the item you can choose shipping method which is similar in cost to HLJ and Amiami. I'll choose SAL since again, poorfag.
I'd recommend it, prices can be great and it's quite simple to use. The other YJA middleman service I tried to buy through was Samurai Buyer, they also offer to buy from Rakuten stores, but checking their fees it wasn't as convenient