I went to the CoS store Garage sale last September and found a pair of Columbia Silver Ridge pants that were missing a leg zip-off zipper *PULL TAB* not even the whole zipper, for $14 (normally 60) and a pair of Vasque Bitterroot boots that were returned -wait for it- because they squeaked when walking. MSRP on the boots is 200, I paid $37 and the squeak went away after about an hour on the trail. I use them for snowshoeing, and general winter footwear.
Someone's gonna get a pristine REI brand Mars 85L pack I got from REIOutlet.com that's seen 1 overnight because I just couldn't make it sit right on my hips, and also it weighs 6lb empty.
That said, there's also utter junk at the sale. Broken electronics, clothes with tears, you name it. It's a good place to get parts for that reason. Pay $25 for that trashed Half-Dome tent, cannibalize the fly, any decent pole sections, and junk the rest.