I am on this journey too!
I just put a computer on my credit card, for the princely sum of £72 I have a old 2013 Macbook Air on it's way to me!
It's not anything too powerful, but it will be enough to do email and web with an up to date Linux installation on it.
It will solve a myriad of problems for me, and mean I can take my Macbook Pro offline to keep as a creative machine - it's perfect right now for that so want to preserve it!!