Amazon has it for 60% off. I just bought two copies.
Their web pages blur new and used now, but it keeps mentioning “new” in the shopping cart, so I assume they are new in wrapper. I’ve never seen them below $90 before.
BTW, from what I’ve heard, the only pictures missing from this collection (at least from his generally-published cartoons) are the center “masterpieces” from Wiener Dog Art. So you might want to grab a copy of that while you’re at it. (I’ve never seen any book or mass-market publication with any of his custom work, so we’re all SOL there.)