Kareem Abdul-Jabbar

The NBA Hall of Famer, six-time MVP, and all-time leading scorer is also an author.  On his website, kareemabduljabbar.com, you can purchase autographed copies of four of his books ($25/$26/$36/$100), a signed basketball ($249), a signed jersey ($250), or you can send your own item to be signed ($150).

I purchased a copy of his novel, Mycroft Holmes, (about Sherlock's older brother).  It was signed on the title page with the note, "The adventure begins".

Total cost with shipping: $36