I've heard of the Nokia one, but since I've never actually seen it for sale anywhere (not even on Nokia's web page, at least not when I've looked for it on their US site), I'm not really considering them much of an option. But, then, I'm rather disappointed in Nokia's handling of accessories in general (in that there are accessories that they don't sell across all of their regions, even though there's nothing bout the accessory that requires any kind of internationalization).

But, yes, that's one alternative. What about others?