The best 'legit' 18650 out there at the moment are Panasonic built 3400mAh. Make sure you buy button top and not flat top. Panasonic ones are a pale green colour - eBay stores like ecoluxshop are reliable. Other companies use 'Panasonic inside' - look for Efest and Xtar as examples. Expect to pay £7-8 per battery. They are worth it.
They'd better be good at £15.95 a pop!
Almost certainly they are Panasonic 3400mah
There are several reputable E Bay sellers doing 3400mah panasonics for less than £8 each
I've used both Torchy the battery boy and Ecolux and never had any problems.