Mwave offers the Cougar LED 140mm Case Fan, model no. CFD14HBG, for $17.99 with free shipping. That's the lowest total price we could find by $2. It features a 14cm chassis, green LED, hydraulic bearing technology, and a speed of 1,000 RPM.
Mwave offers the Kingwin 120mm LED Case Fan, model no. DB-124, for $5.99. This $5 mail-in rebate cuts it to 99 cents. With free shipping, that's $9 under our mention from September and the lowest total price we've seen. (It's also a current low by $16.) It features a speed of up to 1200 rpm. Rebate expires March 31.