eCase via Amazon offers Prime members the Kmashi Rechargeable LED Headlamp for $21.99. Coupon code "56ZMN6G3" drops it to $16.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.40.) That's tied with our May mention and a buck under the lowest total price we could find for a comparable item. It features two brightness modes and the lamp rotates 45°. It requires one lithium-ion battery (included) and also includes a charger. Deal ends September 30.