Hi. My fitbit is in great condition. Are you interested? 
Hello I am interested in you fitbit charger.
Do you have any questions? 
yes are you willing to reduce the price a bit.
I'm willing to go down to $50. But only if you have cash in hand and can meet today. 
I can only to $30 top with cash in hand and will pick up immediately at to charge to you.
The best I can do is $40. This is in like new condition. And I will gladly deliver. 
That sounds great.  Our final cost is $40.