How do I perform a case-insensitive search for files of a given suffix in Python?

I'm looking for the equivalent of find $DIR -iname '*.mp3', and I don't want to do the kooky ['mp3', 'Mp3', MP3', etc] thing. But I can't figure out how to combine the re*.IGNORECASE stuff with the simple endswith() approach. My goal is to not miss a single file, and I'd like to eventually expand this to other media/file types/suffixes.

import os
import re
suffix = ".mp3"

mp3_count = 0

for root, dirs, files in os.walk("/Volumes/audio"):
    for file in files:
        # if file.endswith(suffix):
        if re.findall('mp3', suffix, flags=re.IGNORECASE):
            mp3_count += 1

print(mp3_count)

TIA for any feedback

from How do I perform a case-insensitive search for files of a given suffix in Python?