newegg offers the Cooler Master 120mm Blue LED Case Fan 2-Pack, model no. R4-L2S-122B-GP, for $10.99. This $5 mail-in rebate cuts it to $5.99. With free shipping, that's tied with our June mention and the lowest total price we could find for the pair by $6. Each fan operates at 1,200 rpm and features a 3-pin power connector. Rebate ends October 5.
Update: Stack coupon code "EMCJNNF77" to cut it further to $3.79.