For its newsletter subscribers only, newegg offers the Sunforce 8.5 Amp Pro Series Charge Controller for Small Solar Systems, model no. 60120, for $34.99. Coupon code "US72HRSLE92" cuts it to $27.99. With free shipping, that's the lowest total price we could find by $13. Features include reverse polarity protection to prevent overcharging of 12V batteries, pulse width modulation to extend battery life, boost charging, ability to handle up to 127.50 watts of solar power, and more. Coupon expires March 21.