Rosewill RCI-400MS 400W DC To AC Power Inverter $20 at Newegg

Newegg has the Rosewill RCI-400MS 400W DC To AC Power Inverter with Power Protection and Alarming for $35 - $15 off with coupon code EMCNGHC26 [Exp 4/2] = $20 with free shipping. Converts 12 volt DC power into a 120VAC outlet, includes battery terminal clips, and features overload, short, and a low voltage audible alarm.