Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update.
Link: Banggood product page
Price: -3 USD
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
Old coupons (from the oldest to the newest): 502C6B, e2bcea, BgAuMotor, b71c67, BGNEWestDVR, BGNDVRs, BGCar1val, BGAFF10OFF, BGdragonBoat, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10, 7bcdf9, BgcLuBofErtA10, BG11PP12, BGCuponation10, BGHONEY2110, 13f142
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for SJCAM SJ Gimbal 2.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).