I missed this title from longtime Robert Anton Wilson collaborator D. Scott Apel when it came out earlier this year so I'll mention it now: He has a Silicon Valley memoir called NO PLAN B: The Adventures of a Carbon Unit in Silicon Valley, or How I Made a Million Dollars in Hi-Tech Startups Basically by Just Showing Up (Don’t Try This at Home). It's $14.99 in paperback and just 99 cents for Kindle and offers a look at the area where RAW lived for many years.
Scott has a number of other books, including movie reviews and fiction. The RAW fan on your gift list would likely enjoy Beyond Chaos and Beyond: The Best of Trajectories, Vol. II, a large assemblage of uncollected Robert Anton Wilson writings plus Scott's candid, long biographical essay about RAW, “BOB AND ME: A Record of a 30 Year Friendship.” $19.95 paper, $4.99 Kindle. Here is my review and the feedback from other RAW fans has been good.
Science Fiction: An Oral History is 99 cents for Kindle and has very good interviews with RAW, C.L. Moore, Leigh Brackett, Theodore Sturgeon, Philip K. Dick, Fritz Leiber, Roger Zelazny and Norman Spinrad, but please note the particularly good RAW interview also is reprinted in Beyond Chaos and Beyond. The latest edition of the book has a bonus Gene Roddenberry interview.