I got two emails from Amazon this morning (actually, I think they came in last night).
One was $5 off a book by the author of a different book I'd bought a few weeks ago. Non-fiction. I'd got that other book when it was on sale for around $3 ... but I'm not sure I'm interested in any of his other stuff. Still, I guess I'll take a look. (I know: that's just what they want me to do!)
The other was $5 off a
selected book from my wishlist. They basically picked 5 and said I could have $5 off one of them. They were all books that had been on it for ages.

Like so long ago I listed them, that I couldn't even find them.

They were all books listed between $10 and $13 regularly, so the $5 off brought them down to $5 to $8.
Both offers are good for 7 days.