Just check coupons out (with price alert and history). Do you want to know what the best price is?
Light Color: RGB, APP: HappyLighting, Length: 20M, LED Quantity: 360leds, LED Source: SMD5050, Waterproof: IP20, Wattage: 36W, Material: plastic, Voltage: DC12V
Aliexpress
I could not find it 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. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($41.43): TTBLACK5
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGRARILUX, BGMADFU35, BGwhielabel, 13f142, BGLIG12, BG10OFFAFF1, BGd0b05d, BG60c522, BG00c906, ADMITAD2212, 2022ACTIESNL, Terence, BGLED2203, BG1a665e, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGf94f14, BGLED2206, BG8ReviTrage, Cuponation9, BGLED07, BGOct22LED, BGLEDNOV2022
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – ARILUX 20m SMD5050 Smart LED Strip Light [EU] ($-3)
Price history and price alert
Price history (for all/most countries) for ARILUX 20m SMD5050 Smart LED Strip Light is here.
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)).