I always order from LiteCig, but perhaps because people are creatures of habit. Generally i have got my order in 2 days, i think once 3 - but they have always shipped same or next day - depending on time of order.
Anyhow, YES get cartomizers - BOGE soft cap. Box of 5 for $8.
I have messed with carts AGAIN for the past week trying to mod them and finally gave up and went back to carto's. They are simply a pain in the @&&, IMO. I am done with them until the new atty/tank setup comes out in a few weeks - and will try those.
Edit: Spoom, a cart is about 1.5 analogs before needing to top off, a carto is probably 1/2 pack. Far less hassle. The difference is the hit can be a bit stronger with the atty/cart. Why I even messed with the things again.
Edit: One more point, probably order the standard 510 BOGE to start. The EGO Mega require a syringe to fill. I have read the reviews and they are rather mixed. Some love them, some think they are crap.