Here are a few links to chargers that are suitable for our Chromebooks:
https://www.amazon.com/918337-...
https://www.amazon.com/Charger...
https://www.amazon.com/Nekteck...
https://www.walmart.com/ip/USB...
https://www.walmart.com/ip/45W...
Any 45w charger with a USB-C end should work. Simply searching "USB-C Chromebook Charger " should give you several results.
There should also be some for sale in Wal-Mart, Target, Best Buy, or anywhere that sells electronics.