Comes with 3 months NetFlix too, even for current NetFlix users, so net about $10 + tax.
Google is charging $4 shipping -
Amazon has it with free shipping, and still includes the 3 months NetFlix.
Here's a great review from someone that has one, including details like powering it (doesn't need power if it can draw from the TV), mobile device battery usage (basically unchanged) and some other info -
Please Ignore the Idiots Who Haven't Even Used This Device - Opinions from a Developer