It is possible that your order has landed in our "abandoned checkouts" section. This means that your order has failed, and we do not have an open order for you. Though it may seem as if we have taken money, it is really only a pending charge. Your bank is waiting for us to take the money; however, we cannot, because our site has not allowed the order to go through. These charges should drop from your account within 1 - 5 business days (depending on your bank).
Our online shopping system has strong security features, and usually this happens when there is a small inconsistency in the billing address used.