If you are comfortable with 3rd-party battery chargers, the PowerExtra Charger with Two Batteries (replacements for Canon LP-E17) is on sale for $18, sold by Powerextra’s Amazon store with the order fufilled by Amazon, so Prime members get 2-day free shipping on this. A car charger and a cleaning cloth are also included. It averages 3.9 out of 5 based on 9 customer reviews. The one unhappy 1-star review said the batteries did not work with the M3. Per the product description there (definitely read it before buying), these are not fully decoded, and you have to confirm in the camera’s menu that they are not genuine Canon before you can use them.