All sharpening comes with a cost, (just like hairstyling) and giving it away should start alarm bells ringing. What kind of sharpening are you going to get for free? Ask yourself if the sharpening cost is buried in the scissors cost or perhaps there is an unspecified handling fee.
Extra: Buying Demo Scissors
All sales reps have sample scissors and these are the ones that they allow clients to try out. Reputable sales reps save their new product for real sales. You are strongly urged NOT to buy samples even if the price is attractive. You have no idea where they have been or what has happened to them. On a related subject, some unscrupulous reps put returns back into stock and will cheerfully sell them to an unsuspecting buyer, so be wary of unusually cheap or "as is" pricing.
See Also: Maintaining Your Scissors