Hi, I am interested in your wireless router.  I am short on cash.  WOuld you accept $25?
Oh no, that is too low. This is an high end router with AC wireless.
Oh I didn't realize that.  How about $35.  My router just went out and I don't have enough money to buy a new one.  This is why I am looking into a used router.
I'm willing to negotiate, but I'm going to need more than $35. I could go down to $50.
How about $40.  For that price I could buy a new router with a warranty.  This one is as-is.  I am taking a risk if it breaks.  Deal for $40?
For $40, you're not going to get a router with external antennae and USB 3.0. If you can do $45, we have a deal.