Adorama offers the Ricoh Aficio Wireless Monochrome Laser Printer, model no. SP 311DNw, for $49.99 with free shipping. That's the lowest total price we could find by $20, although several stores charge well over $150. It features print speeds of up to 30 ppm, a 250-sheet paper tray, and WiFi connectivity.
Note that it's expected to ship on April 23.