I have a set of these:

http://www.bowflexselecttech.com/bowflex_selecttech_us/products/552dumbbells/prdcdovr~100131/Bowflex+SelectTech+552+Dumbbells.jsp

and the stand:

http://www.bowflexselecttech.com/bowflex_selecttech_us/products/2in1stand/prdcd~700005/Bowflex+SelectTech+2in1+Stand.jsp

The set including the stand retails for $550. It's a great set of weights. I will sell mine for $325