Sunvalleytek via Amazon offers Prime members the RAVPower Bolt 4-Port USB Charging Station, model no. RP-UC07, for $19.99. Coupon code "7QPZSVZX" cuts it to $12.99. With free shipping, that's $2 under last week's mention and the lowest total price we've seen for this charger; it's a current price low by $7. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $6.98.) It features two 2.1-amp outputs and two 1-amp outputs.