Pavlo
(Pavlo)
3
Illumn as mentioned above is a good seller of genuine cells.
I have used both MTN Electronics and Lithium Ion Wholesale:
https://liionwholesale.com/products/vapcell-26650-20a-flat-top-5000mah-battery-genuine?variant=28408760991838
As you have mentioned, there is alot of junk out there. I always check the battery tests done here before making a decision on which cell to buy:
https://lygte-info.dk/review/batteries2012/Common26650IndividualTest%20UK.html