200 – 600F / 0 – 7.5V / Supporting 2pcs 18650 Batteries.
Go down and check coupons out. Remember to check price history if it is available. 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 coupon code price check (UTC time):
Price history and price alert
Price history (for all/most countries) for VooPoo DRAG 157W TC Box Mod is here. The lowest price was: $29.99.
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)).