Hey sneaky I don't think people are allowed to post links. Just look for ones with lower db ratings but still have decent power for the room size. I run a 4in fan and tbh the LED light fans are louder. I got mine off Ebay.
of course, tent size was the most obvious question, but i also should have asked how much heat you're putting in there.
sometimes i set up a tent that size for a quarantine. i put about 300w of fluorescents into it and exhaust with a 4" elicent fan on a controller so that i can adjust speed. elicents are the only inline fans i buy b/c i like them quiet.