I paid 100 for the "classic" Radio shack DB meter , 15 years ago , not sure if they do it anymore. Maybe under another name ?

Has A and C weighting , slow and fast response. Basic.
If you happen to have an iPhone , there a nice 20$ little application called " soundmeter".
Works very well under 107db once calibrated.
The default calibration is not good but it is accurate under 106-108 once done properly.
http://www.faberacoustical.com/produ...ne/soundmeter/