If you haven't found them yet, there are all kinds of contest
threads by vendors. Some have frequent giveaways/prizes, and others are less often. But posts count in all of them that I've ever played in.
You can go here to find most of them . . .
http://www.e-cigarette-forum.com/forum/pay-forward-pif/105214-contests.html
Find and read the rules, and see what the prize is to know if you even want to play for it. Don't go too far back in posts there, because many contests are short-lived. There may be other ways to find contests, but this is the way that I know of.