Basically copy coupon, view price history or create e-mail price alert. What is best price?
Single 18650 Cell, 510 connector, Built-in Squeeze Bottle of 7.5ml capacity
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
510 Drip Tip with 9 Holes for Innokin ZENITH/Innokin ARES MTL RTA/Wismec AMOR NS MTL Tank | $3.68 | – |
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
Here is price history (for all/most countries) for WISMEC Luxotic BF Box Mod Black.
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)).