sorry to invade, wanted to let you know there was a sigma chi pin on ebay. The seller doesn't say sigma chi in the description or the title, which is probably why no one has bid on it yet.
Just wanted to let you know i came across it:
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2120500084
i look through the listings occasionally to look for sellers who don't list pins with affiliations, in hoping to find one for my own.