You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Package Contents: 1x RDA, 1x 810 Drip Tip, 1x 510 Drip Tip, 1x Allen Key, 1x Spare Parts Pack, 1x English User Manual, 1x Bottom Feed Positive Pin
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 and price update (UTC):
Price history and price alert
Do you need price history chart (for all/most countries) for Digiflavor DROP RDA Black? There we go.
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)).