Check out this Lutron promotion

Since it's IR it would require line of site to the switch right? Does any one know the costs? The web site couldn't find our zip code? So I couldn't get online pricing.
I think I've seen these at my local Home Depot.

HD online (which doesn't have a whole lot of stuff) has a 600W non-remote dimmer for $30 (and another for $60?) and an unavailable IR version (looks like a different remote) for $60.