Walmart offers the Ematic 7" Dual Screen Portable DVD Player, model no. ED717, for $64.98 with free shipping. That's the lowest total price we could find by $18. It features two 7" LCD screens, stereo speakers with 20Hz to 20KHz frequency response, car-mounting straps, remote control, cigarette lighter adapter, and AC/DC adapter.
Note that Amazon charges the same for Prime members, however stock is limited.