Used Buyee as a proxy service to bid some collectible cards on Yahoo! Japan Auctions. They have a nice sniping bid function which is okay and they will notify you through email when someone outbids you’re sniper bid. They also have an easy Translate option that really aids your shopping experience, though the search function is still in Japanese. Promotions wise, there are current discounts on Mercari but have not tried using that site yet. Overall, satisfied with Buyee’s service, though the fees can be quite expensive! Would recommend as have used their services before and it was always rather smooth (besides the rather high fees)!