According to my DB the lowest price is 395.59 USD for Industrial Microscope (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Latest coupon and price update (UTC):
Banggood (395.59 USD)
Banggood warehouse is located in China. Good or bad price? From what I can see this price is higher than average price (321.66 USD). There is one great coupon!
Link: Banggood product page
Price without coupon: 429.99 USD
Coupon (395.59 USD): BGHONEYSP
(CouponsFromChina.com tip: apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG232358
(there’s a little possibility that old coupon will work)
Aliexpress
Click here… to search for HAYEAR 4K Industrial Microscope Camera 180X on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for HAYEAR 4K Industrial Microscope Camera 180X.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).