Basically copy coupon, view price history or create e-mail price alert. What is best price?
Input Noise 32dB, Frequency Range 300-3500MHz, Max Sound Output 115+/-3dB, Working Time ≤16 Hours, Material Plastic, Hearing-aid(Each One) Built-in 25mAh Rechargeable Batterys, Quantity 1 Pair, Total Harmonic Wave Distortion ≤3%, Sound Gain ≥28dB+/-5d, Current ≤2mA, Charging Time ≤6 Hours, Color Skin Color / Black / White (Optional), Voltage DC1.5V
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($40.99): BGb87cae
2. ($48.44): BG75597c
3. ($51.86): Cuponation9
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): BGd7bb7a, tRaDetRaCKeR, BG791718, BGf87df9, BGHECARE1, BG4ee866, BGb7a0c3, 9OFFSUMMER
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Digital Hearing Aid Rechargeable Amplifier is here.
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)).