If you are looking for a basic decibel meter, the Tacklife SLM01 in the red/black color scheme is currently on sale for $10, sold by Tacklife with the orders fulfilled by Amazon, so Prime members get a free 2-day shipping. This is powered by a single 9V battery. They average 4.2 out of 5 based on 60+ customer reviews.

This design seems to go under many different brands. I have a similar one from another brand with a slightly different outer shell. These are not professional / calibrated things, so do not make life-and-death decisions based on their readings.

The same brand is offering their new condition Tacklife Noise Reduction Safety Ear Muffs for $11, fulfilled by Amazon. They average 4.7 out of 5 based on nearly 60 customer reviews. These are hearing protection only. They do not play music.

These are organic sales, not a lightning deal, so expiration date is unknown.