I've found that a great way to finish sets and/or do some trading is through message boards. Here you'll find a list of message boards dedicated to card traders. If you know of any not listed here, please email me at williams@mother.com
Peggy's Baseball Card Board (Updated: 7/28/01)
This board is for more than baseball cards. One of the most used boards I've found.
Sportscardfun - NEW: Added 2/21/00
This site is exclusively for trading and is closely monitored. You must join first, and then you send your messages to everyone. You have a choice to read them as email or on the web. This is a FIRST-CLASS website for serious trading. It's one of the best I have ever seen. I hope many of you enjoy it!
Sponsored by Baseball Planet Sportscards, this board is STRICTLY for
trading. This site appears to be well-used. Check it out.