http://www.alienwarearena.com/giveaway/lol-na-xp-boost-giveaway
Sign up, get your key and punch it in Lol's' store for a free 4-win double XP booster. As of this writing there's about 1700 codes left so act fast.
Note: While you might be able to get a bunch of codes registering a bunch of emails I wouldn't recommend it since that might actually get your LoL account banned.
Note 2: The giveaway seems to be limited to Canada and the US, which is retarded. If you use the NA server and the giveaway shows up as having "0 keys" remaining you can use an US proxy to bypass that and get a code.
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