Scythe Gentle Typhoon 1850rpm are the one I have to cool my radiator. Have a total 5 and I can't barely hear them. Though I do have a fan controller. Don't think they're around $10
What size of fan are you looking for?
Not sure what category this comes under but anyway, thinking of getting some new fans and ws wondering what's quieter. Thermaltake thunderblade or CM sickleflow. I know on paper the CMs look better 31dba vs 19, but apparently they are actually noisy.
Thanks in advance.
p.s. any other fans costing around $10 are also welcome for suggestion.