Could you point to another auction for the same disc? The 300 doesn't support "comic format," which is CBR/CBZ (why the hell not, I ask) so we need to know what kinds of books in what formats you are talking about.
BTW, "Ebay" isn't a publisher, Ebay is a collection of individuals or companies selling stuff. What you buy from one person on Ebay says absolutely noting whatsoever about what someone else offers.
As for buying discs of books off Ebay in general, though-- if it is in the public domain, you can download it for free on the internet, no need to buy a disc. If it is pirated books, on the other hand, you can download it for free on the internet, no need to buy a disc.
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