Wattage 70W/pair, Applicable ambient temperature -40℃~﹢80℃, Waterproof grade IP68, Product theoretical life 5000 hours, Product light body material aviation aluminum (6063), Heat dissipation method copper substrate heat conduction + aviation aluminum body heat dissipation + fan, Current 3A±10%, Lumen value 15000LM/pair, Lamp beads/light source Automotive grade chips, Applicable voltage 9V-32V, Color temperature 6000K.
Just check coupons out (with price alert and history). What is best price?
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.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($37.83): BGSCM11
2. ($40.41): BG589b2e
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGAUTO22, BGdcbfa8, BG0fb48a, BG8ReviTrage, Cuponation9, BGSCM75, BG6ff77d, BGCL313
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for NOVSIGHT A397-F03 H4 70W 2Pcs LED Car HeadLights. The lowest price was: $29.99.
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)).