Latest update shows that ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer Amplifier Board costs $16.59 (in Banggood). Get coupons, create price alert or check price history out! Do you want to know what the best price is?
Channel: 2.1, Bluetooth Version: 5.0(no shielding, 4-8Ω, Color: Black, 10m), Material: electronic components, Input sensitivity: 500mV, Audio Input: AUX+Bluetooth, Power: DC12-24V/5A, Model: ZK-TB21, Chip: TPA3116D2(with AM anti-interference function), Adapter speaker: 20-100W
Latest price update (UTC time):
Banggood ($16.59)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. Good or bad price? From what I can see this price is higher than average price ($16.49).
Link: Banggood product page
Price: $16.59
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTB21, BGGeeK13, BGTB211, BGTB212, BGRUMB15, BGGEE13, BG13geek, BGHONEY2110, BG47f234, BG64efea, 13f142, BG737caf, BG3552f1, BG494704, BG086e4d, BG42839e, 00c906, BG00c906, ADMITAD2212, 2022ACTIESNL, Terence, 8Couponsde, MVC8SPRING, 8BGwbg2204, 8wEbgaInS5, pROMo8cuPoN, hoNEYbGdeAlS, BGJUNEGSG9, Cuponation9, 9OFFSUMMER, BG8OFFCOUPON
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer Amplifier Board.
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)).