I think it just depends on the people bidding. If 3 people want the blue A single, then it'll be more expensive versus 1 person needing the orange A single. It could also depend on how many of that version you see people selling on ebay. The more you see, the less rare it is, and hence less people needing it to finish their collection.
The special million version of H is probably the rarest of the H singles. It can go for 20$+ while all 4 other versions of H go for under 20$ together, but that's because H has all four covers, and its IMO the best (CD design and case design)
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