I can almost guarantee you won't find SCS almost anywhere, and if you do, it will be obscenely expensive.  SCS had the least volume produced, and it wasn't even on store shelves for very long.  I myself missed it when it came out.  

[Raintyger](http://www.raintyger.com/index.php?main_page=index&amp;cPath=1_7&amp;zenid=331cc74539ef3236077009e553a22deb) is probably your best bet if you want SCS junks.

However, Ocean's Edge had quite a lot of junks (including two 6 masters), and OE is the opposite of SCS - huge volumes were printed and it's easily the most common and cheapest set.  Also, if you can find some OE tins, the Special Edition ships are junks that featured ships from SCS.