need some help with fan mounting

I need to get some fans up on my 20H tank since I added my MH pendant. My temperatures as of late are hitting around 83 and I'm a little concerned about it. The issue I'm running into is that since I have an open top, I don't know how/where I'd mount fans. I saw this:
http://cgi.ebay.com/FOUR-Fish-Reef-Aquarium-DC-Cooling-Clip-Fan_W0QQitemZ220000978137QQihZ012QQcategoryZ20755QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
As you can see, it's ridiculously overpriced for a few PC fans and an ac adapter. I'm wondering if anyone has any suggestions to make something similar to that that can be clipped onto the upper rim of the tank.
 
If you have some scrap acrylic lying around you could easily build something that would sit on the upper lip and hold the fans. I'm sure Marc could provide you some more expertise or even make you one for a small fee!


I don't think there will be an off the shelf solution that isn't overly bulky for you.
 
Here are the ones I've made. Feel free to copy it yourself (this is the DIYourself forum).

http://www.melevsreef.com/acrylics/cooling.html

Also, if you want to put one over the sump, here's another kind:

http://www.melevsreef.com/acrylics/fan_tray.html

If you need my help, I'm a PM away.
 
Perhaps a clip-on fan from Staples, CompUSA et cetera

http://www.compusa.com/products/product_info.asp?ref=froogle&pfp=froogle&product_code=51421641&cm_ven=froogle&cm_cat=&cm_pla=&cm_ite=feed
 
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