What All-In-One computer would you recommend that’s both affordable and functional?

I’m trying to get a home computer for my folks that don’t frankly use computers, but would only use them for paperwork. One of them don’t even know how to use one or even type, and my goal’s to just get them one to teach them and for them to use in the future. I’ll be moving out soon and I don’t want to keep them hanging or have them keep calling me to do their online work for them.

The maximum budget would be around $600~ but since that’s probably too low of a price, let me know if any of the ones you recommend may have a sale (like black friday or something).