Universal Double Side Warning Strobe Light Bar [EU] (Banggood, Aliexpress: Universal Double Side Warning Strobe Light Bar-Amber/White Flash Lamp Emergency Traffic Advisor – A (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 price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t want to misguide you about the price. I don’t know if it’s good, because I don’t have enough records in my database… We have found one coupon for this product!
Link: Banggood product page
1. ($43.99): BGSCM11
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Price history and price alert
There is only one database record (it was for $43.99), so you can’t see price history chart.
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)).