Probably a northbridge fan. They're usually 40mm or smaller. Anything you can secure will work, ideally with the same connector so you keep any rpm monitoring.
Places like NewEgg sell them but rape you on shipping. ZipZoomFly is a little better but only reaches reasonable prices in quantity. Does anyone you know (or their parents) have an old pc in the closet?
You might think about converting to an oversize heatsink. The fans aren't necessary with enough aluminum, and it gets rid of one of the more annoying noisemakers in a system. http://www.zipzoomfly.com/jsp/Produc...oryCode=110607
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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