eBay is the online market place where people like you as well as retailers offer new and used items. This includes top quality gear from major brands like The North Face (TNF), Marmot and much more.
Items are either sold as an auction where you can bid until the end date/time of the auction (see column "time left" below for the end time). Sometimes you can get a deal for a fixed price, then it will say:
Register for free and start bidding! (you will leave 7summits.com and go to eBay directly)
We have bought the following ourselves on eBay for our last Denali trip: TNF down jacket, TNF gore-tex pants, Canon EOS camera, lenses, a pulse oximeter, a GPS and a tent!