Not all cartomizers are created equal. I adapted my 510 Ego to 808 cartomizers before the 510 cartomizers came out. The best I've found are the Premiums from V4L as they have the easily removable soft cap. They also have the premiums in blanks too. Other 808 cartos I bought from other suppliers burned my lips and I can't even use them.
As far as shipping I have complained about it each time I have orderd. It's a pain to have to pay 7 bucks to get two packs of cartos or other small items. Doh!