An other solution is accessing e-book stores that do not have DRM or even a charge such as Gutenburg.org. Of course these would have to be accessed via a PC and then side loaded to either the e-reader or a micro-sdhc card.
One could also have a shared KOBO account where all purchases are shared across all members. They would have to work out the payment issue as well as the sync issue but it is workable.
John
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