The Book of Holding: Dungeons & Dragons: A Journal
Used on eBay
Search eBay UK for used and second-hand copies of this kit.
See used on eBay Unbuilt on eBay
Links to eBay are affiliate links: eBay may pay us a commission if you buy, at no cost to you.
Used on Amazon
Amazon's marketplace sellers often have used copies of books; the "used" price is on each book's Amazon page.