What is Super Ego? if it is standard 510
threading then you can use 510 cartomizers. You will not find many prefilled cartomizers for 510. There is a small poorly stocked selection at Liquidxpress. For blanks most people prefer Boge cartos and Ego is over 450mah so it can use both the standard resistance ones and the hotter LR low resistance 2.0 ohm ones (LR ones eat battery power faster). Boge carts have a defined center air channel and no annoying inner seals. I like to use a plastic or delrin drip tip as a mouthpiece on the carto.
Nhaler and IkenVapes also have popular cartos, though Boge are most popular
If Super Ego has some special kind of
threading then I don't know.