A good card site to join other than Beckett.
 

Personally I find this site to be great for Nascar folks and Football.
The other sports are active but those two are the biggest forums by
far. As people look for something to join and be a part of this site
always has opening for people that want to share their passion. Try
to get on Beckett which doesn't happen.

http://www.sportstradercentral.com/referrers.php

If you have a chance check it out it not for everyone but it does have
some great traders and people willing to answer your questions about
any sport in general.

DON