Where and how do you bet on MLB season totals?

All sportsbooks will offer season total wagers. The season totals are based on team wins during the regular season. The oddsmakers will set a win total for the season and it’s up to you to decide if you want to wager over or under the total of wins. Here is an example:
Boston Red Sox: 93.5
The odds for the Red Sox have been set at 93.5 wins. Of course you can’t win a half-game, so this assures there will be a winner or loser on this wager. If you bet the Red Sox to go over the total, they will need to win at least 94 games. If you bet under the total, the Red Sox will have to win fewer than 93 games for you to be successful.