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.
Price history, coupons and price alert are available on this page. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
1. ($26.96): 2022ACTIESNL
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): ADMITAD2212, BG4efc25, BGHealth10D
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Rechargeable Hearing Aids Amplifier? There we go. The lowest price was: $22.66.
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)).