Amazon has a 3-pack of Thermaltake Pure 12 ARGB 120mm case or radiator fans with built-in addressable RGB lighting (https://www.amazon.com/dp/B07MVY3N55?tag=quackdeals-20) for just $39.99 (original price $60). Free shipping!!! These fans are controllable via either a 5V motherboard ARGB header or included analog controller, and their hydraulic bearings ensure quiet operation.
(https://m.media-amazon.com/images/I/61r69aQSGQL._SL1500_.jpg)