Amazon.com: Adafruit 259 , USB Li-Ion/LiPoly Charger, v1.2 : Electronics
Adafruit Micro Lipo Charger for LiPoly Batt with USB Type C Jack - Walmart.com
Adafruit Micro Lipo w/MicroUSB Jack - USB LiIon/LiPoly charger
Adafruit Universal USB / DC / Solar Lithium Ion/Polymer charger [bq24074] : ID 4755 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits