MyTradeWorld via Amazon offers the TFY Universal Car Headrest Mount Holder for Portable DVD Player, model no. 5DVD_BLK, for $22.50. Coupon code "5DVD1702" cuts that to $11.25. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it costs an extra $5.99.) That's the best price we could find by $3. It accommodates DVD players between 7" and 10" and features an adjustable strap.