Just bought a 2015 13 inch MacBook Pro for $450! All it needed was a fresh copy of Catalina! This is my first Mac computer by the way. Bought it off eBay.
macOS Catalina out now - Is YOUR Mac compatible with the upgrade? | Express.co.uk
macOS Catalina: A month with Apple's latest desktop update | Engadget
Used Apple MacBook Air 13.3" Intel Core i7 2.2GHz 8 GB RAM 512 GB SSD (Solid State Drive) MJVG2LL/A (BTO/CTO) -OS X Catalina (Used) - Walmart.com