Just check coupons out (with price alert and history). What is the best price?
Mirroring: Support, Frequency: 50Hz/60Hz, Support: C-Mount lens, Language: Chinese/English, White balance: Auto/manual, Image sensor: 48 megapixel sensor, Digital magnification: 5 times digital zoom, Power supply: 5-12V 1A, HDMI interface: HDMI/USB output, Grid line: 15 Horizontal line / 15 Vertical line / Central scale line /Custom colors /Size, Cross cursor: Support multi-color / size adjustable, Frame rate: 1920*1080 60F/S @ HDMI output, TF card interface: Max 32G, Image: 48M 8000X6000/38M 7168X5376/26M 5888X4416/20M 5120X3840/16M 4608X3456, video format: MOV, Monitor: 16: 9/16: 10/4: 3, Housing: All metal, Model: Camera with HDMI USB2.0 two output, Video save Movie size: 4K(25fps) 2K(30fps) 1080P(60fps) 720P(60fps)(Note: If you need to record 4K or 2K video / you need to use the SDHC class10 TF card.)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG086901, BGGines
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for 48MP 4K HDMI USB Digital Video Monocular Microscope.
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)).