Sling TV has a promo, where if you sign up with the right link, and pre-pay for 1 month of service, they give you a roku stick.
So I did that. Got my stick today, already canceled my subscription. The cheapest plan was $20, $21 after tax.
Here's the link: https://slickdeals.net/f/9552164-free-roku-stick-with-one-month-sling-tv-subscription-20
Shipping is not the best though, I ordered mine last Tuesday, got here yesterday. So 6 days.
Looks like you'd need to connect to a PC with a USB to do it with an Android.
You may have to use Safari to do this on Apple products.
They are still working out the bugs and adding more bandwidth/servers, as long as it's working more often than not it's better than yesterday's performance. You might want to try the Puffin Browser