https://www.cnet.com/news/sling-tv-deal-save-40-percent-for-your-first-3-months/

This offer is for new customers only, and it applies only to Sling's three base tiers of service. (In other words, add-ons don't get the same 40 percent off.)

That means you'll pay $15 per month for Sling Orange, $15 per month for Sling Blue or $25 per month for the two combined. After your first three months, regular rates apply. But there's no contract, so you can cancel if you're not feeling it.