如果你有时间，请回信。

If you have time, please write back.

收到此信后请回信告知.

Would you mind , please, acknowledging the receipt of this letter?

请回信提供下列货物的最低报价。

Your lowest quotation is requested, by return, for the undermentioned goods .

请回信提供下列货物的最低报价.

Your lowest quotation is requested, by return , for the undermentioned goods.

但是，话虽如此，我还是把它交给你这个专业人士尽情发挥吧，请回信告知我你想要多少酬劳。

But, having said that, I leave it in your capable hands to do what ever you want...........and please write back saying how much money you would like.