Windows keys are sold for less then $5 here 
.. Maybe you should roam around the forum a bit to know other sellers too to raise your sales 
.. Maybe you should roam around the forum a bit to know other sellers too to raise your sales u can get for free if u search un google maybe u should search a bit ? but u cant find Retail keys and these are retail keys and i cannot lower the cost , these keys have lifetime warranty which no other seller will give u
msdn codes?