I have just checked coupons. The lowest price I could get is $11.99 for CHSZDEXI 2P20KA DC 1000V Electric Surge Protector Circuit Breaker (in Banggood). Price history, coupons and price alert are available on this page. What is the best price?
Latest coupon code price check (UTC time):
Product certification: CE, Coil voltage: 1000V, Environment temperature: -40℃~+85℃, Number of main contact poles: 2, Protection type: fuse, Shell material: reinforced flame retardant PBT, Brand: CHSZDEXI, Rated current: 40KA, Waterproof: IP20, Rated voltage: 1000V, Model: HDY1-40, Voltage protection: 1.5KV / 1.8KV / 2.2KV, Connection method: terminal, Name: 2P20KA DC surge protector, Installation method: rail type, Arc extinguishing medium: insulator, Setting current: 20KA
Banggood ($11.99)
Banggood warehouse is located in China. There are no coupons for this product in Banggood. I think you want to know if the price is good. Well, this price is higher than average price ($9.49)
Link: Banggood product page
Price: $11.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e
(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
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for CHSZDEXI 2P20KA DC 1000V Electric Surge Protector Circuit Breaker.
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)).