I have an OEM BMW 318ti car cover that is in great condition and was hardly ever used. Along with it comes a lock, key and strap thingy that goes into the lock so you can secure it. Says "BMW" on the front and is made of a waterproof material. Also comes with it's own storage bag!
Make an offer... shipping should be around $20-25 (yeah, expensive, but this is heavy!). If you live near Tampa you can come and pick it up.