Refurb Apple 21.5" 4K Retina iMac | $900 | Amazon

This 21.5" 4K Retina iMac isn’t the latest and greatest—it was released in late 2015—but it’s a solid deal for a Mac at $900 refurbished. That’s $119 less than Apple’s current refurb price for the exact same model, and you still get the same 1-year Apple warranty that you’d get by buying from them.