Daha önceki yıllarda firmanız ile karşılıklı ticaretimiz olmuştur. Sizinle yeniden çalışmak ve aşağıdaki ürünler için fiyat teklifi istemekteyiz.
There has been trading between your firm and ours in previous years. We would like to work with you again and to receive your price offer for the following products.
if the question is 'how much would you pay us for these products?', maybe 'bid' would be better than 'offer'? (I am not sure, other opinions appreciated.)
The first firm wants to buy something from the second again. Therefore they are asking about their "price offer".
On the other side if you want to sell something can you ask to buyer ,'how much would you pay us for these products?"