Got the coolpad with my laptop... Most stores (in my area at least) have them someplace in the store. Especially if they sell laptops. This time of year, I don't need any extra cooling on my laptop, which is nice. During the middle of summer, if I don't have the AC running, I need the extra cooling on the laptop. Of course, during that time of year I don't run my tower unless I need to and then I shut it off as soon as I'm done.
I think, for online ordering, most of the large vendors will carry the item... Compusa has it listed on their web site, check to see if the one closest to you has it in stock. Otherwise, try places like pc connection and other online sources. I'm sure you'll be able to find one easily enough, and probably cheaper than [in]compusa sells it for ($30)...