Supports 2pcs 18650 batteries (not included), Wattage range: 7 – 218W, Resistance range: 0.08 – 3 ohm, TC range: 200 – 600 Deg.F / 100 – 315 Deg.C.
Go down and check coupons out. Remember to check price history if it is available. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. 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 OBS Bat Mod Black. The lowest price was: $36.95.
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)).