$12.99 – 16.4ft / 32.8ft / 65.6ft Colorful USB LED Decorative String Lights with App Control Bluetooth Remote IP66 Waterproof for Holiday Room Decoration – 20M.
Latest update shows that 20m Colorful USB LED Decorative String Lights with App costs $12.99 (in Banggood). Go down and check coupons out. Remember to check price history if it is available. What is best price?
Latest coupon code price check (UTC time):
Banggood ($12.99)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? Good or bad price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $11.32)
Link: Banggood product page
Price: $12.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG02ac06, BG8e78b0, BGb92f92, BGffc430
(I don’t think these’re gonna work, but you can try ’em out anyway)
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.
Price history and price alert
Here is price history (for all/most countries) for 20m Colorful USB LED Decorative String Lights with App. The lowest price was: $9.99.
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)).