Adafruit Micro-Lipo Charger for LiPo/LiIon Batt w/MicroUSB Jack [v1] : ID 1904 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: SUPUlSE Lipo Battery Charger DC 3.7V 1S 1 Cell RC Charger Micro 5 Port Compact Charger with LED Indicator Mini Size Lipo Charger 5 in 1 USB Lipo Charger : Toys & Games