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A garage sale or Ebay. Honestly they're probably not worth much. Only a very few magazines have any kind of collector's market, and frankly Reader's Digest isn't really one of them.
If it's one of the ones with an "I am Joe's Random Body Part" article in it, it might have some small nostalgia value. However, a quick check on Ebay shows that the typical issue is going for something south of a buck... and this is not just those from this century, either, but includes some over 50 years old.