2ml easy switch to 4.5ml capacity with the extra 4.5ml glass tube, Thread: 510.
Just check coupons out (with price alert and history). What is 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 Vandyvape Berserker MTL RTA? There we go. The lowest price was: $26.59.
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)).