請幫看purchase mail文法或句子是否有問題

以下purchase mail的文法請達人幫忙看一下有沒有需要更改的部分, 或者可以更順暢,謝謝! Thank you very much for your quotation. As you may know, however, the market is highly competitive, and the lowest possible prices are essential, before pricing on order with you, therefore, we would like to ask if it is possible for you to make a price... show more 以下purchase mail的文法請達人幫忙看一下有沒有需要更改的部分,
或者可以更順暢,謝謝!

Thank you very much for your quotation.
As you may know, however, the market is highly competitive, and the lowest possible prices are essential, before pricing on order with you, therefore, we would like to ask if it is possible for you to make a price concession and, if so, please also let us know the net 30 days is available.
We would appreciate your kind consideration, and hope to receive your favorable reply at your earliest convenience.
Update: to cindy,

if the term of net 30 days would be avaible if a price change is possible.
這句中間不需要加任何連接詞或符號嗎??
at your best convenience
請問這是什麼意思??

感謝回答^^
Update 2: 第一個問題的中間是兩個if之間
2 answers 2