Had a day to waste in San Francisco. So I went downtown and visited Japantown. It was nice. I found a pretty awesome hobbby store full of import model kits, toys, and collectibles. They had enough Godzilla merch scattered around to keep me hunting until I had scoured the whole store. I got to see the Marmit Monster Heaven Destroyer figure in person. That is one heck of a beastly figure!
Then I found the Kinokuniya bookstore. I've always wanted to visit one so that was neat. They even had a small section devoted to Godzilla and Ultraman. They had some of the latest books including that book of vintage Ultraman concept art. If I were a bigger Ultra fan I probably would've bought that one, but I just don't enjoy Ultraman enough to start collecting stuff from it.
I did find one book I really wanted. The Godzilla Graphic Collection.

Its a nice hardcover that has multiple pages of great pictures of every single version of Godzilla to appear in film to date. It had some really rare stuff too, like multiple pictures of the first prototype G-suit from Biollante and several pictures of the '54 style half-suit made for Tokyo SOS. It also had several new (to me) pictures of the two different suits built for the original film. A couple of these made me have second thoughts about our theory that the second suit (the one actually used for filming) only had three toes. But I'd have to get a better look at the pictures and have somebody maybe translate the captions to be sure.
Sadly, I made the tough choice to leave this book on the shelf too. They had it marked $63 when the MSRP printed on the slip cover was clearly about $40. Amazon Japan has it for about $43 plus whatever shipping costs. But it's definitely going on my wishlist to keep an eye on for the future. It was a really nice book.