AnkerDirect via eBay offers the Anker 21-watt Dual USB Solar Charger for $39.99 with free shipping via the steps below. That's $1 under our May mention and the lowest price we've seen. (It's the best we could find today by at least $29.) It's compatible with most USB-powered devices and features a weather-resistant design. Deal ends July 16. To get this deal:
  1. View the Anker 21-watt Dual USB Solar Charger for $59.99
  2. add it to your cart to drop the price to $49.99
  3. apply coupon code "PBACK2SCHOOL20" and check out via PayPal for a final price of $39.99
Note: This coupon can be used twice per account.