Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Working Current: 1.2mA, Signal to Noise Ration: ≤32dB, Harmonic Distortion: ≤10%, Max Gain: ≥ 40 ± 5dB, Size: 5*4cm/ 2”x 1.6”/ Length X Width, Max Out: 129 ± 3dB, Colour: Silver/ Light Blue
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
1. ($26.96): 2022ACTIESNL
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): ADMITAD2212, BG4efc25, BGHealth10D
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for Rechargeable Hearing Aids Amplifier.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).