$20 a month gives you a 20 channels, including my wife’s must-have HGTV. $5 gets me a bundle that includes the kids’ must-have Disney Jr (you trying arguing with my toddlers). $15 gets you HBO, but I’m not interested. You can add other channels bundles a la carte and quickly go past what you pay with a cable-provider bundle… but the point is you want fewer channels, you only pay for fewer channels.
Still have to pay for cable internet, but that’s almost a given.
In my specific case, I’d be running Sling though the Roku 3 which we already use for Netflix and Amazon Prime. On an old tube-tv with an HDMI-analog converter, of all the perversities.