There is currently an ebay auction for 40 SESC chips (4 colors) for $10 with a buy-it-now of $30

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3237503733&category=899

However, I think your main problem is Greg Susong!! Back on 8/10/02 Greg offered sets to everyone on the board:

http://www.thechipboard.com/cgi-bin/tcbarc07/tcbarc07.pl?read=210062

Seriously, I think most collectors of that type chip have them already plus there are a lot of these chips floating around.