Fry's Electronics offers the Canon PIXMA MX392 All-in-One Inkjet Printer, model no. 6987B002AA, which also scans, copies, and faxes, for $49.99 with free shipping. That's the lowest total price we could find by $5. Features include up to 4800x1200 dpi printing resolution, 8.7 ipm black, 5.0 ipm color, and up to 1200x2400 dpi scanning, and USB.
Update: As a reader found, Amazon offers it for the same price.