Currently on backorder. ETA Unknown.
If you're seeing $85.85, you need to select the option to have it fulfilled by Amazon UK.
Cheap and cheerful 120mm case fans.This is the PWM PST model which can daisy chain.
There's motor whine at 1000ish rpm which can be avoided by adjusting the fan curve.
Edit: Looks like it's all out. I'll keep an eye out and unmark the OOS tag if it comes back in stock.
Edit2: Back in stock but now $60.81
Edit3: Anddd it's gone again.
Edit4: Back in stock at original price ($53.96)