Cars
I work at cars 1-2 times a week at https://www.autoangels.org/.

It is a nonprofit started in 2005. We provide free labor for people in the community through the affiliated nonprofits. Therefore, nobody can just come through as repair their own cars unfortunately :(.
It is located at a church in Bellevue, WA (20 car garage), but there isn't a mandatory religious affiliation requirement (I am not affiliated).
I have accumulated my own tools and skills to work on cars, so feel free to shoot me an email if you need help! ab18gu@gmail.com
Reference Websites
For purchasing used cars, check the price on https://www.kbb.com/
For purchasing new parts, the gold standard is to buy them from https://www.rockauto.com/