LAWSON, a chain of convenience stores in Japan, just announced their latest campaign which starts next week. It's a number of goods from the series A Certain Magical Index (Toaru Majutsu no Index). The top prize (10 winners), is a plush of Index that looks like it's biting your head. Second prize (another 10 winners) is a pajama set in the style matching that which Mikoto Misaka wears in the show. In all, 12,000 prizes are being given out in this campaign.
For this raffle you purchase the campaign items (usually bottled drinks) and enter the code on the receipt at the website to get points, which you spend on raffle entries. Knowing the spending habits of the average hardcore otaku, I'm sure campaigns like this raise a lot of money for LAWSON and the drink companies, and I don't blame them. If they had a similar campaign here in the states, I'd join in.
The campaign site is at: http://lwp.jp/toaru/campaign/static/toaru/