Waterproof WATERPROOF BODY Up To 10m, Display 2.33 IPS TOUCH, Stability SUPERSMOOTH, LIVE STREAMING Support, Resolution 4K/60FPS, Detailed slow-motion Support, Battery 1300 mAh, Vlog YOUR PERFECT VLOGING COMPANION, Wireless Charging Support.
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Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($209.00): BGbf9Strike
2. ($219.12): BgAuMotor
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): b71c67, BGSJ9PL, BGESSJ9, BGsjcamiMars, BGSj9Strikecam, BGSJCAM9, BGNEWestDVR, 7be73f, 185098, BGSJCAM9Strike, BGMMPage4815, BGSJ94K
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for SJCAM SJ9 Strike Action Camera is here. The lowest price was: $209.
Price records source(s): Gearbest, 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)).