Ask them to offer you a price, or tell them what you're willing to pay. If the numbers don't match, either try again or don't buy it. Not trying to be flippant, just emphasizing to keep it simple - taking a flyer in might just make them tell you to buy it there. The "X factor" is that you don't know what they have sunk into it.
I have the opportunity to buy elsewhere and I might do that if I choose to buy. I'd prefer passive over active though...
