The cost of getting another author to blurb your book

I was once on a message board where a person seriously claimed that Stephen King was upfront about charging money for blurbs.

Sure.

Authors blurb books for a variety of reasons (friend, friend of a friend, editor or agent's request), but mostly it’s about paying it forward.

Although one author has come up with a tongue-in-cheek price sheet for people who might request a blurb. Sample: “You’re still using the author photo from your “promising debut.”” (+$75)