The Kobo Sage is an e-reader that includes note taking capabilities. The pen costs extra, but allows you to write on books or in a note application, which makes it useful for some.
Review: The Kobo Sage is an excellent, multi-functional eBook reader - but at a cost
Kobo Sage: the bigger Kobo, is it worth the bigger price?
Kobo sage e-reader in depth review of new features.
Kobo's new $260 Sage e-reader lets you add handwritten notes
The next-generation Kobo Libra 2 is the embodiment of your reading style. With more storage, a faster E Ink screen, and Bluetooth wireless technology so you can listen to Kobo Audiobooks, Kobo Libra 2 is an integral part of your rich reading life. Packed with features and personality - and 32GB of storage for all of your eBooks - Kobo Libra 2 was made to do more.
Kobo Libra 2 | eReader
What is the best e-reader to buy right now?
Review: 7 Kobo Libra 2 vs 8 Kobo Sage, which e-ink e-reader should you choose? - Ausdroid
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