Most Garmin users are probably familiar with DC Rainmaker's site. The guy reviews lots of bike computers, sports watches, GPS devices and other sports technology. He's a triathlete, so he's not only interested in bike stuff, but also in swimming and running gadgets. Most of this stuff is sent to him for free by the companies who make it.
He'll be giving away lots of these gadgets all day long. Every three hours he'll open a post for a new item. If you want to win one, all you have to do is leave a comment and he'll contact you if you have won anything.