The stuff in GNC expires and they mark it down because most people are too smart to waste their money on it in the first place.
Whey protein,vitamins,and creatine work........most of the rest deigned purely for bodybuilding purposes just plain old suck and do basically jack shit for your physique.
Trust me,I`ve been down that road and food is the most anabolic thing you can ingest other than roids.
Ummmmmm....last time I checked, the products I mentioned were some of the VERY SAME type products you just listed.
"Whey protein, vitamins, and creatine work"......I was talking about those very same items, specifically ON 100% Whey (Gold Standard) and CELL-TECH. Those are among the products I purchase when GNC marks the prices down (plus GNC's own brand of protein, if it's been reduced as well). Plus, there are the aforementioned RTDs: IsoPure, ABB products, etc.
And, although I've only tried it once, NO-Xplode would also be a creatine product (though, it's primarly an NO item).