Best Buy offers the EnerPlex Kickr IV+ Solar Charger in Black, model no. KR0004P, for $39.99 with free shipping. That's $20 under our June mention and the lowest total price we've seen. (It's a current low by $25.) It's recommended for small USB-powered devices and features a 1.2-amp output, built-in 500mAh battery (for power storage), and 6-watt, 5-volt solar panel.