I have a $20 meter that takes a few AAA batteries. It doesn't have scientific accuracy, but I trust it to a few dBA, which is all I care about.
I like the AAA batteries because I always have some rechargeable AAAs ready to go.
https://smile.amazon.com/UNI-T-Decibel-Digital-30-130dB-Measure/dp/B08PP5TMS7