Just check coupons out (with price alert and history). Do you want to know what the best price is?
size 465*270*126mm, H level, low speed), Camera lens 2.8, Shooting mode Single picture, Maximum resolution of photos 12M(4000*3000), Working width ≤30m, battery 94.72Wh(6400mah), high speed), shutter speed 1-30/60s, Video resolution 4k: 3810×2160 25fps(default), weight ~3.8kg, 1440p: 2560×1440 50fps, FHD: 1920×1080 30/60fps, Continuous beat: 5, Max speed 1.5m/s, Image sensor 1/2.3inch CMOS 1240w pixel, L level, 0.5h(Hydrostatic water, 1.5h(Hydrostatic water, Using time 4h(Hydrostatic water), Flow resistance 3-4Kn(2m/s)
Aliexpress
There’re some similar (or not) items on Aliexpress
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. 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!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): BGPowerBOAT, AFfbG10, 502C6B, BG136WDF, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BGMPB2020, BGAFF10OFF, bGhOnEy10, 7bcdf9, BGCuponation10, BGDAVIS, BGHONEY2110, BGMATT7
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for PowerVision PowerRay Underwater RC Camera? There we go.
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)).