Be sure to fill out your brackets by this Thursday, March 16.Getty Images

The best gambling stretch in sports is here as nearly everyone who has an office job will be filling out one of these bad boys this week.

The official March Madness blank bracket is here for easy printout: NCAA blank bracket (PDF)

While Warren Buffett’s Billion Dollar bracket challenge is a thing of the past, many websites are offering prizes for a top bracket. Here are some of the top sites with March Madness contests.

CBS Sports


FOX Sports



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