Just check coupons out (with price alert and history). You probably want to know what is the best price?
SONY IMX117, 98-Feet Waterproof, Anti-shake EIS, 1200mAh 3.85V battery, Package Contents: 1x Action Camera, 2x Battery, 1x Waterproof Case, 1x Sling, 1x USB Cable, 1x Steel Wire, 2x Glue Sticker, 1x Bike Stand, 2x Helmet Base, 1x Connecting Bracket, 1x English User Manual, 1x Lens Cap
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Price history and price alert
Check out price history chart (for all/most countries) for Siroflo Firefly 8 Action Camera.
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)).