Here's how it works: There's this Wink app, that's free in the iTunes App Store, which you can use to connect to a variety of devices like Honeywell thermostats and Schlage door locks. For things that don't fall in the “Ready to go” category, there's a Wink Hub which will communicate to those devices, like Dropcams, Leviton outlets/switches, and the Rachio sprinkler controller.
Regular price for the Wink Hub is US $79.99, but through Labor Day the “intro” price is $49.99. If you buy one Wink-compatible product you get the Hub for $24.99, and if you buy two the Hub sets you back 99 cents. Looking at the products listed on Amazon, all of them are more than $50, but if you're looking to get into home automation anyway, picking up a couple of accessories which make the Hub nearly free isn't a bad way to do it. You may find some more affordable options at Home Depot too, so it may be worth a trip to check out what's available in your region.