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ESPN's Matthew Berry and many other people host these one day fantasy NBA contests at DraftStreet that are free to enter and have cash prizes. No scam/tricks - You can find them on their facebook/twitter pages but if you're too lazy to search you can join one of the free rolls through this link - details are below. DraftStreet has them and other affiliates sponsor these contests to help gain exposure to their rapidly growing website.
Here's the contest link http://bit.ly/GTzxbw
Here are the rules:
$350 prize pool Free to enter - One day competition (Friday Night only)
Each participant will have $100,000 in salary cap to fill the following roster requirements, you must not exceed the cap and you must fill every position: C, C, F, F, G, G, Flex, Flex
The person with the highest fantasy score at the end of the night wins top prize, but the top few finishers will take home some cash just for doing well.
Cash out via paypal or check immediately after the completion of the last game of the week, or use your winnings to enter future contests with higher prize pools
You can change your lineup as many times as you like up until tipoff of the first game, so get in early so you don't miss out.
Here’s the link once more: http://bit.ly/GTzxbw