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JimBHaving collected all four sets that Barry mentioned (E93, E94, E95, and E98), I agree with his order of relative scarcity. From toughest to easiest: E94, E98, E93, E95. I would throw E96 and E97 in between E94 and E98.
As for a guess at actual numbers, it is really hard to say, but I will take a stab at it.
E94s 50-75 of any given player regardless of color
E98s 100-125 of any given player regardless of color
E93s 125-250 of any given player
E95s 200-250 of any given player
This is a completely unscientific guess. I would guess that T206s are about 100-200x easier to find than E94s.
JimB
P.S. Great thread!