Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
2x LiitoKala NCR18650B 3.7V 3400mAh 18650 Battery | 6.94 USD | – |
More on Aliexpress… Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (9.62 USD): AC18
Coupon (11.00 USD): bcnlxk
(CouponsFromChina.com tip: this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 6335CK
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for 2x NCR18650B 3400mAH Battery with Case? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).