I was wondering that too, they have a digital copy but do they have the rights to resell that image. I suppose it might be old enough to be public domain but that probably means you can find it for cheap/free elsewhere.
People are free to acquire these old photos from the Seattle Municipal archives, they'll even email you the high-res scan of it (I forget what format it is, but it's a big file, these have all been done in very high res) if you request it. Then you can print it out for yourself. Our poster of this scene was about 30" tall, very clear!
I'm not 100% sure, but I wouldn't be surprised if using these for resale is frowned upon...
