The Last Harvest is also worth having, nearly all the images are made with the Holga, its a small book but good quality again in both image quality and production standards. It might be cheaper from the States than the UK . The Killip book is great I’m sure you will enjoy it. I met him on the top of Croagh Patrick when he was doing the Ireland book, he was showing me his cameras a Plaubel Makina and he also had a nice Leica. A nice guy.
Some of Killips books are being re published. Check out steidl.De The In Flagrante book is the one I’m waiting on. You can often get signed copies at face value on the site.