I signed up at this great sportsbook years ago, so unfortunately I can use this fantastic offer:

Money back on your first three non-winning combi bets!!

The bonus differs a bit depending on the language of the site, but on the English site the offer is almost too good to be true. If you loose a combi bet you get your money back, and you only have to wager the refund once, at no minimum odds. That's almost risk free!!! But watch out – the terms seems to be a little different on other language sites where there is a requirement for minimum odds. Still a good offer, but not risk free. So take the offer from the English page, before they adjust the terms! Click here to read more!