You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
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):
1x Magnet, 1 X English Instruction Manual, 1x Converter Cable, Package Contents: 1x Endoscope, 1x Side Mirror, 1x Hook
Price history and price alert
Do you need price history chart (for all/most countries) for Dodosee A7TR5 5m 7mm Endoscope? There we go.
Price records source(s): Gearbest
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)).