According to my DB the lowest price is $17.99 for SEALIGHT X3S H7 6500K LED Car Headlight (in Banggood). Just check coupons out (with price alert and history). What is the best price?
SEALIGHT X3S H7 18000 LM 6500K Cool White LED Car Headlight Modification Parts Automotive Front Light
Latest price update (UTC time):
Banggood ($17.99)
Banggood warehouse is located in China. I have no active coupons for you right now. Well, is it a good price anyway? Well, this price is higher than average price ($16.62)
Link: Banggood product page
Price: $17.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGAMMT03
(you can check these old coupons out, but these probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – SEALIGHT X3S H7 6500K LED Car Headlight [EU] ($13.99)
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 SEALIGHT X3S H7 6500K LED Car Headlight.
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)).