Car-Accessories via Amazon offers Prime members the OxGord OBD II Diagnostic Car Scanner, model no. CRST-MS300, for $13.95 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.67.) That's $36 off list price and the best deal we could find, outside the offer below. It works on 1996 and later OBD II compliant vehicles and features a backlit LCD display.
A close price: Covershield via eBay offers it for $14.84 with free shipping.