There's also that one sportsbook that offers a faucet I think their site is called betja but I haven't tried them yet though.
Yes, it's betja.com. They have an hourly faucet of 0.000001 BTC and that is also their minimum wager. You can claim the faucet every hour but you need to play with the coins and stake them on events with minimum odds of 1.40 or higher. Their only requirement to withdraw the winnings is to make a deposit and to bet the deposited amount on an event with the same minimum odds that I mentioned before.