I don't know how you found that. I've been searching for days and couldn't find one. Any $50 examples you stumbled upon? It's just to power on some duct fans to circulate the equipment room air when the processor powers on.Amazon has a bunch of power strips with 12 V trigger inputs. They range in price from maybe $50 to $200 after a quick search. There are also DIY schemes much cheaper.
Here is a Panamax one -- don't know anything about it other than it has a trigger input: https://smile.amazon.com/Panamax-M8-AV-PRO-Theater-Power-Management/dp/B00M0FG00W/ref=sr_1_13?dchild=1&keywords=power+strip+with+12V+trigger&qid=1593645969&sr=8-13