ATM you can buy WS418B 4K 8MP Dual Lens Outdoor WiFi Camera for $36.99 (in Banggood). Go down and check coupons out. Remember to check price history if it is available. What is the best price?
WS418B 4K 8MP Dual Lens Outdoor WiFi Camera Wireless PTZ Security ONVIF H.265+ Cam Night Vision AI Humanoid Detection Auto Tracking Two-Way Audio Monitoring IP Cameras
Latest coupon and price update (UTC):
Banggood ($36.99)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Low/high price? Hmmm, price is higher than average (which is $34.49 right now), so better set price alert down below…
Link: Banggood product page
Price: $36.99
Old coupons (from the oldest to the newest): BG06117f, BGec759a
(system checks these coupons on every price check (like once per 24 hours), but you can check them 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
Price history (for all/most countries) for WS418B 4K 8MP Dual Lens Outdoor WiFi Camera is here.
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)).