You can create price alert here, copy coupons and view price history. Best price?
Rated power: 1800W, Rated voltage: 220 – 240V, Rated frequency: 50Hz
Aliexpress
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Here are coupons that you can use.
Latest coupon and price update (UTC):
Price history and price alert
Here is price history (for all/most countries) for Zanmini DH-QN03 Electric Portable Heater.
Price records source(s): Gearbest
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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)).