I've never heard of any retailer (including Overdrive) being restricted in the number of eBooks they can sell to customers.
They are quite often however restricted from discounting the price, even for large orders.
Overdrive (the main distributor that sells eBooks to libraries) pretty much charges the price of a full book, often higher than Amazon or Kobo etc, for each and every eBook license. They then are responsible for the computing power behind the check-out and DRM process for the libraries.
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