For the guys asking about the facebook groups, here are the three main ones, I joined these recently when I heard bm3 was selling for cheap, even the new licenses go for $535-$550. I got mine transferred from an N26 and activated successfully on my N55, for $330. A few days later someone was selling it for $300, you'll find plenty in $300-$350 range, technically we should only be paying half of the original price:
https://www.facebook.com/groups/276734759145710
https://www.facebook.com/groups/175436739327911
https://www.facebook.com/groups/bootmod3