I don't know how long this is good for, but I literally just tripped over it looking for something else.
https://www.amazon.com/Lord-Rings-Illustrated-J-R-R-Tolkien-ebook/dp/B09JF7NBT4/
https://www.amazon.com/Lord-Rings-Illustrated-J-R-R-Tolkien-ebook/dp/B09JF7NBT4/