IP Camera is for 30.99 USD (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
Banggood (30.99 USD)
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. Is it a low price? This price is higher than average price (29.00 USD) for this item.
Link: Banggood product page
Price: 30.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): Cuponation9, BG8ReviTrage, BGcoupon8off, BGGutscheine, BG00c906, BG8OFFCOUPON, TTBLACK5, BG589b2e
(probably won’t work, but you can try them out)
Aliexpress
Click here… to search for SONOFF CAM Slim IP Camera 1080P on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for SONOFF CAM Slim IP Camera 1080P is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).