it's an oem set? was it made by blackberry or a third party?
This is the real mccoy my friend, an oem headset.
well these days they call a third party made products oems now. you can never be sure. anyway how about i give you 5 bucks for it? 
Oh, I'd don't think that will work. This is a fine piece of equipment, it even comes with an On/Off button, as I listed in my description.
well, they all have on and off buttons now. it's not a big deal. besides we';ve had on and off buttons on things for a century. tell you what, 6 bucks. i come and pick it up. you don't even have to leave your house. 
Let this incredible headset go at only $6? I couldn't take less than 8.50!
you know what? I think that's  fair price. let's do 8. this system doesn't do decimals 
Sure, I guess we can do $8.