Just check coupons out (with price alert and history). Do you want to know what the best price is?
MAX 12M distance, SNR: ≥98dB, Net Weight: 160g, Frequency Response: 20Hz-20KHz(±1dB), Power supply: support 5.5x 2.1-2.5mm, bluetooth: 5.0 Version, Power Amplifier Chip: TPA3116, Power Supply: DC9V-24V (the voltage can not over 24V), Audio Inputs: 3.5mm AUX or bluetooth or USB or RCA or TF card or USB Stick, Audio Outputs: Banana Speaker Jacks, Output Power: 50Wx 2 (24V/4Ω load), Speaker Impedance: 4Ω-16Ω, Size: (W)110x (H)90x (D)50mm
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):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
1. ($33.64): BG589b2e
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTPA3116, BGFCTPA, BG311611YB, BGCuponation10, BGHU0459, BGHONEY2110, BG63378d, 13f142, BG3cc06b, BGd886c5, BGAlerabat6, 2022ACTIESNL, Terence, BG5a19a4, Tabby20, 2203ActiesNL, BG1efeb0, MVC8SPRING, 8BGwbg2204, BG79be39, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, hoNEYbGdeAlS, BGJUNEGSG9, BGd0e600, Cuponation9, 9OFFSUMMER, BG8ReviTrage, BGcoupon8off, BGGutscheine, BG00c906, BG8OFFCOUPON, TTBLACK5
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – TPA3116 Class D Bluetooth 5.0 HIFI 2x50W Audio Amplifier [EU] ($-3)
Price history and price alert
Do you need price history chart (for all/most countries) for TPA3116 Class D Bluetooth 5.0 HIFI 2x50W Audio Amplifier? There we go.
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)).