Bestek 300W Power Inverter DC 12V to 110V AC Car Inverter with 4.2A Dual USB Car Adapter for $19.99 @Amazon By admin | November 9, 2018 5:29 pm EST 0 Comment Bestek via Amazon has 300W Power Inverter on sale for $29.99 – $10 w/ coupon code " 3JNB6D2M"= $19.99.Shipping is free.