If you have an older MacBook, here's a very inexpensive charger

This L-type magsafe charger for pre-2013 MacBooks is already cheap at [amazon_link asins='B07YD7M6Y2' template='PriceLink' store='boingboing' marketplace='US' link_id='4d8fe022-47b8-41cd-890d-1fee88ca1b03'] but if you use promo code NX72DAJR, you can get it for half that price.