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runscottCracker Jacks are one of the easiest vintage sets to collect safely, buying online. The reprints are among the easiest to spot and you will sometimes find steals because people are so afraid of reprints. If you ever see a CJ online that you have doubts about, just evaluate the seller as well as possible based on descriptions, feedback,etc., then ask questions: e.g - "send a clearer scan", "what size is it?",etc.
I have had great luck buying CJ's on ebay.