AmazonBasics AC Charger Adapter for Nintendo 3 DS XL, 3 DS, and 2 DS – 6 Foot Cable, Black Price: $9.58 (as of 26/05/2020 08:14 PST- Details) & FREE Shipping.

AC adapter for charging any Nintendo 3DS, 3DS XL, or 2DS
Plugs into a standard (120-volt) AC outlet to quickly charge device
Allows for charging the battery pack, even while playing

Usually ships in 24 hours