Original BMW? Order through your dealer. You can go to the BMW website to get part number etc. the dealer will most likely give you a slightly better price, especially if you pick it up from them instead of shipping.
There are plenty of options for non-BMW ones, just search the general discussion forum for stubby antenna.
I got one for really cheap and it didn't fit properly, it would get lose with just a slight twist on the antenna. At that point I decided no more experimentation and just splurged for the BMW one.
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