You're right that it's easy for me to say, but it's also true. Tech sites give hundreds of prizes each year. Many are limited to the US (or some other territory) but many aren't (luckily for me). The chances of winning in such a competition typically range from 1:20 (sometimes even better) to 1:2000. Winning might depend on pure luck or on other things (number of posts, creativity or any number of things), which would mean you can increase your chances with a little work.
I follow a lot of tech sites, and was lucky enough to win here. And TechSpot got what it wanted, which was another follower. There were many other competitions I participated in but didn't win (and some that I did in the past). In any case, odds are good. The chances of winning exactly what you want aren't great, but the chances of winning something are pretty good if you keep at it.
Just as an example, Overclockers Club is currently running a remembrance competition for a member who has passed away, and there are lots of prizes there (but only for veteran enough members). It's very sad and I don't feel all that good linking this competition to this post, but it's the first example that came to my mind, and it provides an example of the number of prizes you can get in some competitions.
Here's the link. Bjorn3D has a folding competition to win a GeForce GTX 480 and is reporting on a Gigabyte Facebook contest to win some Gigabyte mice. Ars Technica is
giving away an Asus Eee 1201N netbook and some games. I'm sure there are other competitions running at this point in time. (I'm not entered into any of these, BTW.)