Roll Mechanical Range: 338°, Operation Frequency: 2.402GHz~2.480GHz, Bluetooth: Bluetooth 4.2, Pan Mechanical Range: 331°, , Tilt Mechanical Range: 338°, Charging Time: 2.5h, Payload: 150g~280g, Battery Capacity: 1200mAh, Runtime: 10h.
Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
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Click here to search by yourself. Here are coupons that you can use.
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Banggood
Banggood warehouse is located in China. I can’t find any active coupons for this product 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!
Additional Banggood coupons: first page and second page
Price history and price alert
Do you need price history chart (for all/most countries) for Zhiyun Smooth Q4 Combo Gimbal? There we go. The lowest price was: $155.
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)).