@grandmaser97, my advice is to simply ask each casino if they allow such large stakes on sports betting - simply visit all online casinos that have sports betting, collect their contact e-mail addresses and send them all the same query.
He asked of bookies or book makers and not casinos. If it is about casinos, I would have told him to use Livecasino.io which has been my favorite not because I joined their campaign but because I like using the site and their service is excellent. Casinos are for gambling while bookies are for betting. Bookies are about sport matches while casinos are for games like blackjack, roulette, slots...
If there is a betting option in casinos, they are obliged to pay the winning bet. Note: Use only licensed casinos available!