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Aliexpress
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Latest coupon and price update (UTC):
100W full power output, Supports 1pc 18650 battery (not included), Thread: 510, Diameter: 22mm, Capacity: 2ml
Price history and price alert
Price history (for all/most countries) for SOFGOD R01 Mod Kit is here.
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)).