This list is by no means all-encompassing but these sellers have been validated by the vaping community over the years and they sell genuine A-grade cells.
Sites are listed in no particular order. Contact me if you have any link you think should be included here.
North America:
- imrbatteries.com
- diy500amp.com
- liionwholesale.com
- illumn.com
- batterybro.com
- shop.involt.ca
- orbtronic.com
- 18650batterystore.com