You should be able to find a receiver used. They pop up from time to time. You can buy a receiver from a 3 or 5 series as well.
You're looking for the following part numbers
65129192274 or -73
I see someone is selling from a e60 5 series on eBay for $200
You could install it yourself. The wiring is all there. You will also need the mounting bracket as well with a couple of bolts.
65156951369
Coding should only be 1 hour though.
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