Sure! there are probably out there and with even higher capacities but THEY ARE ALL FAKE!!!
The highest capacity 18650 cell currently in production is 3,400 mah as far as I know, buy from a reputable dealer like member KumaBear here in the forums.
only fake ones
the top of the line panasonic seem to have 3400mAh, and they cheat a bit, a higher charge voltage, and lower discharge voltage (i think)