iEGrow via Amazon offers Prime members its iEGrow 2-Bay Smart Li-ion LCD Battery Charger for $16.99. Coupon code "NDKI8EVF" drops it to $10.19. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.65.) That's $2 under our mention from the week of Black Friday, $9 off, and the lowest total price we've seen. It features a voltage detector and recharges 3.7-volt lithium-ion batteries. Deal ends March 20.