[Gr8Beldini]

Can anyone explain the high prices assigned to these 2 cards? I understand that they are offered as "company only" versions but my question: Since these 2 cards appear on the 10 card company sheet, aren't they just as scarce as the other 9 cards included with that sheet? If anyone can offer any insight I'd appreciate.

Also, I heard that there are book cataloging the 61-63 Post cereal cards - I'd like to know where I can info about those (variations, pricing, scarcity, pictures etc). Thank you in advance... JB