Timmy, I'm sure you have worked this out already, but just for anyone else looking....I believe the only trader that sells those helicopters is Trader Caitlin out in the Wasteland. She sells all sorts of unique items. Also, good on ya for letting us know about the bartering buffs.....I was under the impression that they did stack as well, so thank you for the intel. Loving this series mate! I don't want it to end!!