iEGrow via Amazon offers its iEGrow 1-Bay Smart Lithium-Ion Rechargeable Battery Charger with LCD Display for $12.99. Coupon code "3EBSLFZA" cuts that to $6.49. Plus, Prime members bag free shipping. That's the lowest price we could find for such a charger by $7. It displays real-time charging status and can be charged via a microUSB cable (included).