http://thehobbyconnect.com/index.html
But that place haighter posted looks pretty boss. I'll bet that dude is paying a small fortune in rent every month, but the surrounding clientele is likely very price insensitive so he can get a king's ransom for a model.
It's kind of rare to see a store cater to so many different hobbies.
When I was last in SF many years ago now, there was a Games Workshop store in a mall setting, somewhere near the Giants' stadium as I recall.
"Iowa women were better than Illini men" - Potomac32