Although I haven’t bought an A&A game this way, you might try E-Bay, because even if its used, the seller will usually post pictures of the box and list what items are or are not included (if anything is missing)… I’ve had really good transactions on other old out-of-print games by going through E-Bay, including old out-of-print editions of Risk, Clue and other such games (for my kids… current prints suck compared to a lot of the older ones).
I’ve gotten my hands on some mint-condition 20 year old games this way for a reasonable price.