I've been collecting since 1972, and one of the most sought-after hard to find items for me was the KIRBY UNLEASHED portfolio, advertised in most 1972 DC books. I finally found and purchased a perfect mint copy of it by mail order (in the waning days of the pre-internet period) in 1996 for $50.00.

Two Morrows reprinted it with additional material about 10 years ago, and I purchased that version too, and for purposes of keeping my original intact, usually flip through the Two Morrows version. Honestly, except for the cover, it doesn't live up as well to expectations as the superior JACK KIRBY: MASTERWORKS portfolio from 1978, which shows a lot more reproduced 60's and 70's unpublished covers and pages by Kirby. KIRBY UNLEASHED has a greater ratio of Golden Age Kirby material.