Betpanda os one of the new casinos with sport betting features, you may like to take a look at the casino to see if it what you can decide to use and try out, and apart from Betpanda we still have some few projects in the sport booking market that are also doing pretty well.
I agree with this one, although they are new in the sports booking services, but if you have to check their odds, it's very competitive as compare to others. Although there are big names out there as far as sport books goes, and I do agree that they are already established, but it might be good to try others to get that kind of experience.
So best of luck and hopefully the OP might get to play on old sports bookies or experiment with a new one.