When a customer bargain with me I sell something online. One buyer bargain the price with me--offering me a much lower price. I replied him I can offer offer him a deal which is five dollar cheaper than the original price. In the end of the email, I writes "Let me know how you think of the deal." I'm sure my expression is surly understandable, but can someone tell me a more professional way to express the same meaning? Thanx a lot.