From a quick search, they are not millionaire-level expensive. Here for example is a 20W 222nm lamp that costs $436, with a lifetime of several thousand hours.
Sure, I'm not saying it's cheap. I'm just saying there are lots of software developers and whatnot who could keep themselves in UV air filters if they really wanted to.
https://uv-can.com/products/gerani-far-uv-light?srsltid=AfmB...