Aliexpress
Click here… to search for PowerVision PowerRay Underwater RC Camera on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood.
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
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
(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
Check out price history chart (for all/most countries) for PowerVision PowerRay Underwater RC Camera.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).