Today most of the Refurb consists of the MacBook Air. If your priority is the price above all other considerations, you will find it interesting.
However avoid the lowest price since the machine is fitted with a too small SSD.
One finds, for example, a MacBook Air Core i7 1.8 GHz 4 GB / 256 GB SSD for 1,179 euros or a 1.6 GHz Core i5 with 4 GB / 128 GB SSD at 889 euros.
Avoid models with only 2GB of RAM (a heresy) and watch out for older models based on Core 2 duo.