Nice little saving if you don't mind the colour (personally I think black and purple go great).
Appears the 2 pack is on offer for £13.49.
3 pin connectors
120 mm fan tuned for high-airflow and large volume cooling
Translucent, frosted fan blades and red LEDs for a dramatic effect
Nine ultra-thin fan blades, a sleeved bearing system for ultra low noise
Custom fan enclosure for dusting air in the right direction with minimal interference
Single fan also on sale for £7.98! https://www.amazon.co.uk/gp/product/B00F6S10NW/