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You can build your own pretty cheaply, probably $10-30 for the fan, and $10 worth of PVC and $5 worth of PVC glue (unless you already have some).
Considering you buy a premade commercial model for around $35, I'd rather have a nice polished one and save myself the hassle... since I'm not saving much money. If the commercially-sold ones were like $50-100, I would look into making my own, but at that low price, it doesn't seem worth the hassle.
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