Just check coupons out (with price alert and history). Best price?
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):
1.0 inches Big Color Screen / 100 – 300C / 200 – 570F
Price history and price alert
Check out price history chart (for all/most countries) for Sigelei Fuchai Duo-3 255W TC Mod Black.
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)).