Betting arbitrage or sports arbitraging is a particular case of arbitrage arising on betting markets due to either bookmarkers different opinions on event outcomes or plain errors. By placing one bet per each outcome with different betting companies, the bettor can make a profit.In the bettors' slang an arbitrage is often referred to as an arb A typical arb is around 2%, often less, however 4%-5% are also normal and during some special events they might reach 20%.

    You can make risk-free money from bookmakers from abs but you do need a good amount of starting capital (at least £500) to make a worth while amount.If you have less funds try Betfair Trading or Risk Free Racing first to build up your funds then move on to this. 
    You can find the arbs manually by looking through all the odds offered by differnt bookies or use a service which does it for you and e-mails everytime one comes up. Using the service is easy and it means you can play poker or trade at the same time as it is not very time consuming, total time with the serice wont be more than a few mins a day to place the bets- with out it it would take all day as odds keep changing. 
    I have tried a few arb services but Arb Hunters best value and quickest to detect money making arbs-