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BESTEK. via Amazon [amazon.com] has BESTEK 300W Car Power Inverter w/ 2 AC Outlets & 2 USB Ports) on sale for $34.99 – $15.56 off when you apply promo code GD22MNR2 at checkout = $19.43. Shipping is free w/ Prime or on orders $35+.

Features:[list][*]300W continuous / 700W peak DC to AC power inverter, 11-17V compatible [*]2 AC outlets and 2×4.8A USB ports