My gut instinct is that E103s are not as tough as E107s, but they are still one of the tougher E sets (E90-E107). To take a rough stab at numbers, I would guess there are less than ten of any given E107 and probably 25-30 of any given E103, though as Barry mentioned there are a couple that a very tough.
Ebay can be a rough indicator, but not perfect. E107s usually go to auction houses rather than Ebay, so it can be misleading. Conversely, also as mentioned by Barry, because the size of the E107 set is roughly five times as big as the E103, that can distort that actual rarity of any single card for those not paying attention to specifics.
On a side note, I was discussing these sets with Brian Terjung who is quite knowledgeable on these two sets and he suggested that they might be much more closely related than many have noticed. Hopefully he will chime in here with specifics. I believe he did some research linking Williams Caramel with Breisch-Williams.
JimB
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