[Translation from Japanese to English ] I'm sorry, my explanation was insufficient. If I don't go through eBay, I can...

Original text

すみません、私の説明不足でした。私はeBayを通さない場合は〇〇ドルで販売できますが、eBayに出品する場合は50ドル上乗せして〇〇ドルで販売するつもりです。

Translation / English

I'm sorry, my explanation was insufficient. If I don't go through eBay, I can sell it for $OO, but if I list it on eBay, I will add $50 and sell it for $OO.

Translation / English

I apologize for my lack of explanation. I can sell for $〇〇 if I don't go through eBay, but I'll add $ 50 and sell for $ 〇〇 if I get it up on eBay.

Translation / English

I am so sorry. That was a lack of explanation. I can sell it at 〇〇 dollars if not via eBay. But if I will list to eBay, I will sell it at 〇〇 dollars adding 50 dollars.