I'm a huge Harry Potter fan, but I don't feel the need to collect them all - just certain characters. I originally bought 10 hoping to get Bellatrix, Luna, Myrtle and Dumbledore. I was sent part of my order in pairs and part separately. Packages that came two at a time for some reason were always duplicates! I was fortunate that the duplicates I got were the characters I wanted - Bellatrix, Luna and Dumbledore. I've also ordered/added a pack here and there with other orders. I ended up getting the ones I wanted, so maybe buy one at a time if you're hoping to avoid duplicates.
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