I used to be into the european car scene, and ebay.de was a great resource for euro domestic market parts. I did a quick seach for sg02 and found nothing, a search for "silverstone" yielded a number of sg01s but none of the 02. Finding one and convincing the seller to ship to the states are 2 different things so good luck. I would also try some of the other euro ebay.xx variants, maybe you will get lucky and things line up for you. In my experience, the hunt is part of the fun, which is why you don't settle for what is easily available.
edit: I found 1 sg02 on ebay.co.uk. Unfortunately, it is for a full system, not just the case and the auction has no info regarding US shipping... it doesn't hurt to ask:http://cgi.ebay.co.uk/Silverstone-SuGo2-Cube-AMD-3800-x-2-Dual-Core-HDMI_W0QQitemZ170148241943QQihZ007QQcategoryZ179QQssPageNameZWDVWQQrdZ1QQcmdZViewItem