AmazonBasics mounts are among the cheapest ways to hang your (brand new?) TV to the wall, and three different options are on sale today. Of particular note is the low-profile mount, which uses a bunch of tiny nails to hold almost any TV in place without finding a stud.
Update: The no-stud model is up to $25 now, but the other model is still on sale.
Their more traditional mount is also on sale, which includes the ability to tilt the TV up and down at will, though it does require a stud.