Material: ABS+silicone, Size(rechargeable base): 68 * 45mm / 2.68 * 1.77in, Hearing device Size: 70mm/2.75inx52mm/2.05inx40mm/1.5in, Hearing device weight: 2.5g, Charge time: ≤6 hour, Type: blue-left / red-right, Working time: ≥20 hours, Rated working current: ≤2mA, Battery: 1.5V / 2mAh, Package weight: 225g, Name: Hearing Device, Rechargeable base: 39g, Main Color: balck, Package size: 150 * 95 * 57mm / 5.91 * 3.74 * 2.24in.
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.
Updated:
Banggood
Warehouse in China.
Link: Rechargeable Hearing Aids Sound Amplifiers
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons:
1. First page
2. Second page
Price history and price alert
Price history (for all/most countries) for Rechargeable Hearing Aids Sound Amplifiers is here. The lowest price was: $46.99.
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)).