It's a bit of a loaded question and will definitely depend on which country you are betting from. Are you looking for cryptocurrency based betting or do you include fiat based betting? Are you looking for American football or soccer, as the name varies depending on where you are based. You would have to imagine that most sportsbooks will be offering near identical odds on every match, many use the same backend provider for statistics calculation and will alter their prices depending on new information. You really have to sign up to the biggest ones in your country and start to do the research yourself - you'll never make it a profitable endeavor if everyone else has the same information as you.