LAKESIDE, VA—The theoretical possibility of receiving a $50 mail-in rebate motivated shopper Jim Crewes, 28, to purchase a color printer Monday. "I really can't afford to be buying a computer right now," Crewes said. "But if I buy the printer and two toner refills, and save the receipt and UPC symbols from all the boxes and buy two more Pitney Bowes products and save those receipts and symbols, and then send it all in with the original rebate coupon, and the offer's still good by then, I'm looking at 50 smackers." Crewes was also swayed by the printer's extended-warranty option, which provides free service and repairs if the printer broke and he actually shipped it back to its manufacturer, which he never would.