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Marc S.needs to be taken as a part of the equation. I think E-107s are easier to find overall, but their set size at 150 is the reason for that. Given the relative set size of E107 compared to E99/E100 at 30 cards, I think it is safe to say that E107s are not 5x as common as an E99/E100. So easier overall -- but definitely much harder if you are trying to track down a particular card (or build a set)