Power Supply Supplier?

So, does anyone know a reliable supplier for computer power supplies? I'm trying to find the best price on a (hopefully new) 220W power supply for a Dell Optiplex GX520. I've got this computer in my house that runs 24/7, and the cooling fan that's inside it started to struggle today. It looks like this one:

You know that 24/7 running PC sounds awfully familiar.... ... ... I would suggest eBay / online retailer (possibly dell themselves), as they usually have the best prices and deliver direct to your door... ...

You have the desktop version right? Not the Mini-Tower or Small Form Factor versions?

Edit: If you can get the part number on the PSU you can probably find the exact replacement as there are 3 version of the GX520 and they each have different PSUs.

The part number is should be between the 3rd and 9th character of the serial number on the PSU. ex: CN0N837273050G7AE45EA

http://accessories.us.dell.com/sna/products/Power/productdetail.aspx?c=us&l=en&s=dfh&cs=22&sku=NC912&mfgpid=167261&chassisid=8316&~ck=dellSearch&baynote_bnrank=0&baynote_irrank=2

You probably won't find much cheaper then that especially for a replacement part in a Dell.

I concur with Alundaio.

Power supply ordered from Dell. Thanks for the research!

Well,I am pretty much useless on Tech Support, but I will hit the tip jar a quick one. Thanks for taking care of the server .