Rick,

I had the Honda dealer install mine. Cost me $150 installed.

But if you want to install it yourself, you should be able to do it for under $60. You'll have to deal with draining antifreeze, though, and removing/reinstalling those covers under the engine.

Lot's of web sites sell the Honda block heater. Here's just one example:

http://www.hondapartssuperstore.com/catalog/index.php?cPath=28_259_263_271

When researching mine, I saw sites that sell them that also have the instructions posted, which look pretty straightforward, but I don't have the site URL handy.

If you are interested in the cost of running it, it is a 400 watt unit, so you can run it for 2 1/2 hours for one kwh (you won't find this out from a Honda dealer - I had to put a meter on mine to determine the wattage). Check your electric bill to find out how much you're paying for a kwh. I bought a heavy duty timer for about $5 and run it for 2 1/2 hours before my morning commute.