I'm betting on sportbet.io https://bitcointalksearch.org/topic/sportsbetio-proud-partner-of-southampton-fc-1458034 . you can try it. I bet with ethereum with a minimum of 0.01 ETH. so far so good, and they have good customer service and a very good website. recommended
I'd also highly recommend sporstbet.io for small bets. They allow 0.01 mbtc that is equal to 0.0001 BTC (1000 satoshsi) as the minimum bet. They also have lower withdrawal fees and the withdraw are nearly instant.
They have daily bet boost option for almost every sports, which makes their odds much better than all of sites.
