Hey there how are you?
I'm fine, thank you.
I see you have that nice sub box, how low are you willing to go on it?
Well, when you consider the fine crafstmanship, and the fact that it will universally fit in some vehicles, I think $50 is a steal.
That's definitely a good price. My problem is I have only $30 bucks and don't get paid until friday and my friend's birthday is tomorrow. 
Well, that's okay, I can take credit cards through my online store ;)
I can do you one better. I have 5 lbs of gummy bears that have been sealed since I bought them. How about I literally sweeten the deal by giving you all 5 lbs of gummy bears and 30 bucks?
Well I'm sure that would appeal to some sellers, but unfortunately I'm an end stage diabetic, which is why I have to sell my sub box, so I couldn't eat any sugar :(
Oh no worries, I have 3 lbs of sugar free gummy bears! Great for diabetics and being constipated! How about I pick that sub box up and drop off the 30 bucks with your sugar free colon cleansers...er...gummy bears? 
Okay, I guess you have a deal.