Not getting the last series cards in the store or them coming in so late that there weren't enough ordered to complete your set. I never understood why the lower series were so plentiful that you could easily collect them all, but the higher series were not. I only completed one set, 1968, by buying packs and trading prior to the "one series" release of 1974. All the others required mail ordering the cards that never made it into our area in sufficient quantities.
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