Hi Lindsey — I believe organizations like the OEN typically offer $200 honorariums for faculty reviewing textbooks. Grants for writing can very significantly based on the work that the author will be doing. We’ve actually had a conversation on paying OER contributors before; I’m dropping in a link here in case it is a useful starting point: Office Hours: Money, Money, Money! Paying OER Contributors (17 October 2019, 2pm EST/ 6pm UTC).
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