Takashi Yamazaki reportedly denied reports that ‘GODZILLA MINUS ONE’ had a $15M budget. “I wish it were that much.” (The original source claims that the director said it was probably around $13 million).

so it’s even cheaper?

It may have been a 2 billion yen budget, which is what I imagine it costs on the high end. Even then, that comes out to 13 million USD at the moment. I could even see it being less like Shin Godzilla, which only cost 1 billion yen (which at the time was around 10 million USD but is now 6.9 million USD).