[Estragon]

It cost $750 to become a citizen, last time I checked.

[Spoom]

Naturalization applicant here: Current N-400 fees are $680 including biometrics[1]. Used to be a lot more, closer to $1000.

(That is certainly not counting the thousands of dollars to get to the point where I was eligible for naturalization.)

1. https://www.uscis.gov/n-400