You can get them from the same site you linked! Cartomizers
Most cartos you will buy will not be prefilled, generally speaking. If they are prefilled they will say, if they don't say then 99% I'd guess they are blanks.
Carto-tanks are a cylindrical container that holds juice, usually with a cartomizer put down the middle (that has had a hole or two or 3 punched into it) that gets "refilled" from the tank reservoir.
Pic:
Bottom left is a carto-tank, top right on the black PV is a vivi-tank. The metal tube down the middle of the carto-tank is an oversized cartomizer (with flange on base to stop it from slipping off, that's important).
There's also clearomizers or vivi novas tanks that have a different feed/coil set up. They use wicks to draw liquid onto a coil.

I could be completely mistaken, I'm far from expert and the terminology can get confusing at times.
Most cartos you will buy will not be prefilled, generally speaking. If they are prefilled they will say, if they don't say then 99% I'd guess they are blanks.
Carto-tanks are a cylindrical container that holds juice, usually with a cartomizer put down the middle (that has had a hole or two or 3 punched into it) that gets "refilled" from the tank reservoir.
Pic:

Bottom left is a carto-tank, top right on the black PV is a vivi-tank. The metal tube down the middle of the carto-tank is an oversized cartomizer (with flange on base to stop it from slipping off, that's important).
There's also clearomizers or vivi novas tanks that have a different feed/coil set up. They use wicks to draw liquid onto a coil.

I could be completely mistaken, I'm far from expert and the terminology can get confusing at times.
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