I was researching aftermarket warranties for my X and started by seeing which ones my local BMW dealership offers. They are selling one from Chrysler. I think it is called the chrysler service contract. It came in 1-4 year plans with unlimited mileage. It covered basically everything you could think of. Just make sure you do a lot of research before you purchase any warranty. Dont buy it if its advertised on TV, newspapers or anything like that. Those companies tend to be less credible. Asking you dealership and service advisor could be a good start.

Plus, if you purchase most any warranty while factory warranty still exists on the car they wont do an inspection. This could work out in your benefit.