Nova Tech US via Amazon offers the VoltCube 150-watt Car Power Inverter for $15.99. Coupon code "HA5AZNBS" cuts the price to $12.79. With free shipping for Prime members, that's tied with last month's mention and the lowest price we could find by $9. It provides 150 watts of continuous DC to AC conversion, two USB ports, and AC outlets for multi-purpose charging. Deal ends December 31.

You can also purchase the 400-watt version for $28.79 $27.19 via the above coupon with free shipping. That's a $7 savings.