Monoprice offers its External Battery Pack and USB Charger, model no. 9282, for $18.30. Coupon code "DEALNEWS2025" drops it to $14.64. With around $3 for shipping, that's the lowest total price we could find by $8. It features up to 2.1 amps of charging power, two USB ports, and four LEDs displaying remaining charge and charging status. Deal ends June 23.