Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Compatible: Gopro Hero 6 /5 / 4 / 3 / 2 + and DJI Osmo Zhiyun Mobile Gimbal Handheld
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Price history and price alert
Here is price history (for all/most countries) for Xsteady Adapter Switch Mount Plate.
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)).