Daily Steals offers the refurbished 2-lb. Apple MacBook Intel Core M 1.1GHz 12" Laptop in Silver, model no. MF855LL/A, Space Grey, model no. MJY32LL/A, or Gold, model no. MK4M2LL/A, for $799.99 with free shipping. (Breed via eBay charges the same.) That's the lowest total price we could find for a refurb by $82, although we saw it for $50 less in September. (It's also $400 under the best deal for a new unit.) It features an Intel Core M-5Y31 1.1GHz Broadwell dual-core processor, 12" 2304x1440 Retina display, 8GB RAM, 256GB SSD, 802.11ac wireless, USB-C port, and Mac OS X 10.10 Yosemite.
Also available is the 512GB version in Silver, model no. MF865LL/A, Space Grey, model no. MJY42LL/A, or Gold, model no. MK4N2LL/A, for $949.99 with free shipping. That's $113 below our February refurb mention and the lowest total price we've seen. (It's a current best for a refurb by $50 and $476 less than the best deal for a new unit.)
A 90-day warranty applies, although it's unclear who backs it.