You can watch Fox Sports 1 (FS1) without cable on Fubo, Sling TV Blue, DirecTV Stream, Hulu with Live TV, YouTube TV, or Fox One.
The cheapest way to watch Fox Sports 1 (FS1) live is Fox One for $19.99/month.
Fox Sports also offers a one hour "preview pass" for free on their website.
Fox Sports was originally founded to accommodate Fox Network's acquisition of NFL broadcasting rights back in 1994. Now you can watch many more leagues, both regular and post season MLB games, as well as NCAA football, NASCAR, College Hoops and the ever-more popular MLS.