When I first tried to order it, it was "gone" from my cart at checkout too. I tried it again, but this time I held down my "Ctrl" key on the keyboard since I have pop-up blockers on my machine. It went through the second time. I think it did open up a new window when I placed the order the second time (like a pop-up), but maybe it was just coincidence that it worked when I held down the Ctrl key. I got an e-mail confirming the order, so hopefully it went through. If so, I'll return the one I bought at Sam's Club for $55.