3000mAh / Dual Circuit Protection Battery / 4.0ml / Top Filling / ECL 0.18 ohm / EC 0.3 ohm / 0.5 ohm Coil Head Clearomizer.
Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Price history and price alert
Do you need price history chart (for all/most countries) for Eleaf iJust S Ecig? There we go. The lowest price was: $19.99.
Price records source(s): Gearbest
Click on image to enlarge. 
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)).