I was wondering if anyone knew which of the ESB card back variations (Mail-Away Offers) were the rarest and why they aren't listed in price guides? Was the entire line up to the point of the offer re-issued with these offers or just some? The five back variations are as follows:

-Free Secret Star Wars Action Figure (Bossk)
-Star Wars Display Arena Offer
-Free Star Wars Action Figure Survival Kit
-Free 4-LOM Figure
-Free Revenge of the Jedi Figure (Admiral Ackbar)

I'm sure it's possible they were all produced in equal #'s and that's why we usually get only one listing for them in price guides but I really doubt it.

Any info. would be appreciated.