PSE&G Customers in NJ can buy the Ecobee3 Lite or the Nest E for just $19. Or they can buy the 3rd Gen Nest of the Ecobee4 for $99.
Personally I’d go with the Ecobee3 Lite option. The Ecobee thermostats are rated higher than Nest thermostats and the main difference between the Ecobee3 Lite and the 4 is that the 4 comes with Alexa and a room sensor. You can buy 2 room sensors separably for less than the cost of the difference between the 2 units. Plus if you disable Alexa on the 4 you have an annoying red status bar that can’t be disabled.