What is the age range and what kind of show? Teens and younger, I would go with Yugioh and Pokemon, although I don't know much about them. I would go with Magic for 16+ and usually the newer sets are what you want. Return to Ravnica, Avacyn Restored, and Core Set 2013 are the newer ones. Packs are usually like $4 and you can find boxes (36 packs) around $100.
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If the auto isn't on-card, it might as well be in-person.