Here's a little more info on the Traveling Wilburys: A Limited Edition Portfolio, which is quietly available for sale. GeorgeHarrison.com lists the portfolio as:
Curated by acclaimed art director David Costa, this limited edition portfolio of 250 numbered lithographs includes photographs by Alberto Tolot during the making of the “Handle With Care” video, Neal Preston’s iconic photos for the first album, Caroline Greystock’s capture of early rehearsals, as well as Polaroids by the Wilburys themselves.So, all of the lithographs appear to be pictures from the book. Turns out, select James Perse Stores in California are offering the deluxe portfolios, but nowhere else. They are $350 and the store will make arrangements to ship one if you can't visit a store in person.
UPDATE: The Traveling Wilburys online store just added the portfolio for $300 as well as the Genesis Publications book for $319.