As for me, I have a website that clearly lists what I pay so when I get contacted the individual has no real excuse to expect more. When I do get some folks contacting me and asking $300.00 for a laptop, for instance, I know they didn't bother to look any further than my contact page. It happens.

I would have to look at them before making any decision. The first thing I would (probably) do is set up a day & time for me to drop by and take a look at them. If he doesn't specify what he wants, then I just go with the notion that he's just looking to be rid of them at recycling prices. Even if there is some kind of mix-up in that category, I can use it as a networking or prospecting opportunity.