I don't know what the usual price is for this, but at £0.81 (about $0.99) it looks like a bargain:
Hobart's 79th Armoured Division at War: Invention, Innovation and Inspiration (
UK link)
For those who've never heard of "Hobart's Funnies", they were modified tanks built for D-Day, that carried bridges, cleared mines, swam, etc. At the time they were an incredible innovation, now their modern equivalents are in service with every major army.