I finally broke down and purchased the book series from Amazon Japan. They're currently on book 17 (and going)!
I also decided to change my avatar (after...5 or 6 years??) to Furuta. I believe this current picture is his expression after one of the warlords blows himself up while strapped to the "Hiragumo teakettle," an item that Furuta had earlier been dreaming (and making crazy faces) about seeing.