Well i dont have any that i wana get rid of but i use these two.
This is the hard wired one Though i have the Genuine Canon one, Couldnt find the genuine one on ebay this morning, Though does the same job just a button lol

http://cgi.ebay.com.au/Remote-Shutte...QQcmdZViewItem

And this one is the Wireless one i use, Which is great for rig shots, self portraits, anything where u need to be away from camera
http://cgi.ebay.com.au/Wireless-Remo...QQcmdZViewItem