12V 600W Car Audio Subwoofer Amplifier Board [EU] (Banggood, Aliexpress: Impedance: 4-8 ohm, Color: Black, Audio Encoding: Mono, Material: Aluminum Alloy Panel, Gross Weight: 641g, Voltage: DC 12V, Max Power: 600W, Size: 170x145mm (the best price with coupon)).
Basically copy coupon, view price history or create e-mail price alert. What is best price?
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 Europe 
. I’m not sure about the price, coz I have only 1 record(s) in my database.
Link: Banggood product page
1. ($26.34): BGLMQ15
2. ($27.27): BGSCM11
paste coupon code in your cart and click Apply 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): BGCarAud4, BG845979
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was $25.19).
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)).