Kobo also serves DRM-ed ePubs using .acsm files. And they offer discount coupons (can only be used on non-Agency pricing model books) and most of the time you can also read the book online via their website as well as downloading it as ePub or via their Kobo Desktop Reader software (proprietary format).
They've a number of promotional free books available, you could try one and see how you like using their webstore.
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