I have been watching the refurb site, thinking maybe I'll go with the MacBook Air, just hoping for a restock (on the Canadian site).
I can't speak for Macs other than those I"ve followed, but I've learned that patience is a virtue in the American Refurb Store.
If the Mac you prefer is a current model, the specs you prefer will come up sooner or later...provided that they're not too far off the wall.