By Steve Woodfield The winter ski season is just a few months away for the Northern hemisphere. If you're in the market of a pair of used skis, shop online with your ReShip.com account for all of the best deals. Not exactly sure what to look for in a pair of used skis? Here are some tips: Skis Don't Go Bad Structurally Skis aren't two strips of wood that are going to warp and become unusable. The makeup of modern…