Hello, I am interested in learning more about the condition of the home theater system
It is brand new and in great condition
Great, are you flexible on price? This is an older model, so I think $40 is fair. 
I wouldn't take less than 75, they are a very good brand
What if I picked it up myself, and threw in a JBL speaker set, could you accept 50 then ?
It is for pick up only and I have no need for a speaker set.
So there is no real flexibility or negotiation potential to come down below 75? Work with me here, I know that this is a good brand, but the box is beatup and you could simply resell the JBLs just like these. 
How about 65?