I recommend you tell us more about your phone (model) and your general location (for the stores you can access). Anyway, privacy screen protectors are often hit or miss, not just with fingerprint unlock, but also the screen quality. Many cheap ones make the screen much darker and unpleasant to read since you see the grid (so far everything I ordered from Aliexpress had this issue).
In the end you'll have to test and try different brands to find what's best to you. I settled on this one which I imported from German Amazon, but it is not available for all Pixel phone models: https://www.amazon.de/Yiunssy-Sichtschutz-Privatsph%C3%A4re-3D-Vollabdeckung-Displayschutzfolie/dp/B09JNLML4B/