THE AD SOUNDS LIKE YOU ARE BUY 1 GET 1 FREE AND FOR JUST THE COST OF SHIPPING YOU WILL GET A SECOND SET. THEY CHARGED 17.90 TO SHIP ONLY 2 UNITS IN THE SAME BOX AND THE SHIPPING DIDN'T COST THEM EVEN THE AMOUNT OF ONE 8.95. THEY ARE RIPPING PEOPLE OFF WITH THE EXTRA SHIPPING COST. THAT IS HOW THEY ARE ABLE TO OFFER THE SECOND UNIT FREE THEY ARE MAKING IT UP ON THE SHIPPING. read full review »