newegg offers the Cooler Master Hyper N 520 CPU Cooler , model no. RR-920-N520-GP, for $29.99. This $10 mail-in rebate drops it to $19.99. With free shipping, that's tied with our July mention and the lowest total price we could find by $10. It's compatible with select Intel and AMD processors and features a 92mm fan. Deal ends October 2.