According to my DB the lowest price is 399.99 USD for HISEEU 4CH 8MP Outdoor (in Banggood). Just check coupons out (with price alert and history). Best price?
Latest coupon code price check (UTC time):
Banggood (399.99 USD)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. Well, is it a good price anyway? It looks like it’s a good price (lower than average (415.87 USD)).
Link: Banggood product page
Price: 399.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG589b2e, BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BG28ef1d
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Click here… to search for HISEEU 4CH 8MP Outdoor PoE Wired CCTV Kit on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for HISEEU 4CH 8MP Outdoor PoE Wired CCTV Kit.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).