Well, I know everyone knows to get people's contact info they have to go to a trading website (example Markeedragon) and then individually scan topics for e-mail addresses; and not all topics contain e-mail addresses.
This is a little common sense trick that I use to speed up my scamming process:
I am using MarkeeDragon as an example
Step 1: Go to the MarkeeDragon forums (or any forum, really) and click the search button
Step 2: Type in @hotmail.com (or @yahoo.com/@gmail.com... whichever one you want) and make sure you check the box saying " Show a preview of post body with results".
Step 3: In the Forums To Search section, scroll down to find WoW USA Trading or whichever forum you want to scam. Select multiple forums by holding down CTRL while you select the several forums.
Step 4: Voila! You have a list of people within the last week that have their hotmail/yahoo/gmail or whichever e-mail you chose. You can click the topic and you are Guarenteed there is an e-mail, or sometimes the e-mail actually shows up in the preview.
Happy scamming!