While we've had this game for quite a while we only started to actively play it within the last couple of weeks.
After running a few battles with the Core set we considered making some expansion to spice things up, but it seems as if the Rebel and Imperial Squadron packs are in extremely short supply. They show as out of stock on the FFG website and 3rd party Amazon retailers are asking $50+ for the things.
Did we just start to actively play the game at exactly the wrong time? I do see the Rebel and Imperial Squadron II packs as available, but honestly those ships don't quite capture the imagination the way the classic Y-wing, B-Wing, Tie-Bomber etc. do.
(Personally I'm just tired of getting annihilated by Howlrunner...)