Hey there, I'm on a tight budget.  How low would you be willing to do?
Did you have a price in mind?
Just because it's not brand new, I was hoping to get $140 for it.  
50% off is a bit too much of a reduction. I would be willing to go as far as 25% off for a total of $224
Throw in a brand new helmet and you've got yourself a deal!
Corry, can't throw in a helmet, but I would throw in a pump and a spare innertube.