Xigmatek XOF-F1254 120mm FCB PC Cooling Fans (4-Pack) for $9.99 shipped. Here is a screenshot for your reference. This is naturally for people who are technically inclined and like to build or customize their PCs. It is two 2-pack so you get a total of 4 fans. These fans feature fluid circulative bearing (FCB) and are 120mm in size.