You can find the $50 White-Rodgers P200 programmable thermostat for much less at most major retailers. In particular, it's available for $24.79 at Home Depot and for $23.77 on Amazon. While it certainly isn't a fancy thermostat, it still has a lot to offer and I can comfortably recommend it.
What it lacks in modern design appeal, it makes up for with a bonus feature: 5-1-1 programming.
The other four thermostats I reviewed in this price range offer 5-2 programming -- that means you set one heating and cooling schedule for Monday through Friday and a second schedule for the weekend. With a 5-1-1 thermostat, Monday through Friday has the same single shared program as before, but you can program Saturday and Sunday separately to give you more customization options.
That way, if your weekend routine involves hitting the gym or going to work on Saturday morning and sleeping in a bit more on Sunday, you can program the P200 accordingly.