Club Nintendo is offering 20 free coins for completing a bonus survey. Just check out the "Earn Coins" section of your account and you should see the bonus survey as one of your options. It'll help ya earn the neat Mario posters they put up a month or two back.
Edit: Seems like relatively recently they've added a "Thank You" series of surveys as well, if you've registered a console. I saw 20 coins for the Wii survey and 10 for the DS Lite survey, but there may be more. These expire June 30th so don't let em slip!
Edit: Confoosious pointed out that there is a thread dedicated to trading codes here: http://www.cheapassgamer.com/forums/showthread.php?t=207895.
Edit: Seems like relatively recently they've added a "Thank You" series of surveys as well, if you've registered a console. I saw 20 coins for the Wii survey and 10 for the DS Lite survey, but there may be more. These expire June 30th so don't let em slip!
Edit: Confoosious pointed out that there is a thread dedicated to trading codes here: http://www.cheapassgamer.com/forums/showthread.php?t=207895.
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