Best Buy’s Mexican site doesn’t have a listing just yet, but this Google+ post from the official Google México account says that the recommended retail price will be 699 pesos. That’s a bit over fifty bucks with the current exchange rate, but not terrible in terms of exported electronics, and certainly cheaper than most streaming alternatives. Remember that you’ll need a free HDMI port on your television to use Chromecast, and if it’s an older TV without HDMI 1.4, a free power outlet. A local Wi-Fi network is also a must.
The list of Chromecast-compatible apps is growing all of the time, and more and more devices are being upgraded with screencasting support (it’s included by default with Android 5.0). Get excited.