Very happy with a ASUS Zenbook UX305FA. Everything worked with no issues when I put Ubuntu MATE on it. It feels more-or-less identical to a 13 inch MacBook Air.

Very happy with a ASUS Zenbook UX305FA. Everything worked with no issues when I put Ubuntu MATE on it. It feels more-or-less identical to a 13 inch MacBook Air. It was ~$400, but "used" in my case was relatively new and unused. I bet if you found a version with a blemish or two it'd be ~$300