I just bought some sale items on Moosejaw.com. It seems like the code OUTLET20 will take 20% off anything on sale and not just outlet items, because it applied the discount to my whole order of sale items. I came out with a pretty sweet deal. Worth a try if you see some things you want.
P.S. All Smartwool is 25% off at REI.com tomorrow through the 28 of Nov.