I bought a refurbished one of these in January of this year -- though I see that there are none of them available in the refurb store as of right now. The refurb inventory changes pretty rapidly though, so it might be worth watching in case one does pop up -- I suspect that they'll go quickly, and I almost wish I had purchased a backup.

https://www.apple.com/shop/browse/home/specialdeals/mac/macb...

Oh well, hopefully my current one lasts another few years, otherwise I'll probably have to give Windows a try as my main machine again, for the first time in ~10 years.