Yes there is a website called neokyo but I think it no longer supports Mercari Japan. Best for Amazon japan and other websites. I've heard the shipping is a bit cheaper

Japan shopping service and zen market are both way better. Buyee is such a scam and a bad company

Unfortunately, yes. Several. But the biggest competitor (Neokyo) was knocked out by Buyee stating they didn't want another company buying items from them.

Zen market is way cheaper than Buyee. Buyee has too many hidden fees and they're service is trash. They won't give you refunds if your package is lost.

I'm not sure. But I am comfortable in buying products through buyee.