Latest update shows that 51MP Digital Video costs 176.99 USD (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Best price?
Latest price update (UTC time):
Banggood (176.99 USD)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. Low/high price? This price is higher than average price (151.99 USD) for this item.
Link: Banggood product page
Price: 176.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGGines, Tabby20, BGDCTOOLS
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
Click here… to search for HAYEAR 51MP Digital Video Microscope Camera on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for HAYEAR 51MP Digital Video Microscope Camera.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).