Question RPM Reduction Cable or adapter

I just need to slow one fan down on several different computers. Is there anything cheaper that might come in a 10-pack? I may not be using the right key terms for the search. The SilverStone 2-Pack looks nice, but I bet there is something cheaper for several computers. Thanks


Amazon.com: SilverStone Technology PWM Fan RPM Reduction Cable Dual Pack, Black, SST-CPF05 : Electronics
Or there's this:

https://www.amazon.com/Noctua-NA-SRC7-Low-Noise-Adaptor-Cables/dp/B00KG3KP1U?ref_=ast_sto_dp