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Because, in general, school budgets are not overflowing with excess cashflow. Picking the cheaper option which meets all the demands will trump having a variety which scales up in price and only adds slight variation*.
*I use slight here in the context of what the schools likely goal is, to obtain and distribute devices which allow students to read various books. This can be done just as easily on a tablet as it can on eink, the preferences of the reader for the medium with which they read do not come in to play.
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