The ecobee3 lite Smart Thermostat is currently on sale over at Amazon. It is priced at $144 right now, which is good for $25 off of its regular price, and also brings the ecobee3 lite down to its lowest price, all-time.
ecobee3 lite is the "cheaper" model in ecobee's lineup. Don't let that steer you away from it though. The only difference here is that it doesn't come with the external sensors to keep the temperature lower in your home, as temperatures change outside. The ecobee3 lite will save you around 23% on your heating and cooling bills per year, since it is able to automatically adjust the temperature to keep you comfortable, but without using more energy. Additionally, ecobee3 lite does work with Alexa. Unlike the ecobee4, it does not have Alexa built-in, but it is compatible. So this means that you can talk to an Echo and ask it to change the temperature of your home. Which is also a pretty cool feature. Of course, like most thermostats, you do have the ability to go ahead and control it through the ecobee app - available on both iOS and Android right now. So you can turn down the heat when you're on vacation, or away for a few days and really save some money.
This item is also eligible for Amazon Prime's free shipping. Which includes free two-day shipping, and pretty cheap (usually $3.99) next-day shipping if you need it extra fast. If you are not an Amazon Prime member yet, you can sign up for a free trial of Amazon Prime. You'll get 30 days free (if you're a student, you get 6 months), and then it's $99/year (or $49/year for students). Prime members do get a whole lot more than just free shipping though, so be sure to check out the full benefits.