[Translation from Japanese to English ] If you could sell it to me for $380, then I am thinking of purchasing 10 of t...

Original Text / Japanese

もし380ドルで販売してくださるなら、白を10個購入したいと考えています。
実は別の方で380ドルで販売して下さる方がいるのですが、ベストセラーであるfiberglassguruさんが、その値段で売ってくださるならfiberglassguruさんから購入したいと考えています。
よろしくお願いします。

Translation / English

If you could sell it to me for $380, then I am thinking of purchasing 10 of the white ones.
I've got another seller who offerred me $380, but if I could get the same deal off you, who is a Best Seller, I would rather purchase it from you instead.
I will be waiting for a good reply.

Translation / English

If you could offer $380, I would like to purchase 10pcs of white.
Actually, other person sell by $380 but you are the bestseller so if you could offer that price too, it would be great.
Thank you.

Translation / English

If you could possibly sell this item to me for $380, I would like to buy 10 of the white ones. The problem is, another seller is selling this same item for $380 , but since you are a "Best Seller", I would like to purchase the item from you. If you could sell the item to me for this price, I am interested in buying from you.
I hope we can come to an agreement.