Rosewill RCI-201MS 200W DC To AC Power Inverter for $4.99 Shipped
Rosewill RCI-201MS DC To AC Power Inverter for $4.99 shipped after a $15 rebate. Here is a screenshot before the rebate for your reference. The Rosewill RCI-201MS converts 12V-DC power into two 110V-AC outlets and also comes with a USB charging port.
A very similar deal was also reported by: