Information about e-cigs

I quit smoking about 3 years ago, in favour of e-cigs. I started when I was 15 and nothing worked up until that point. I have been using cartomizers, which are sent from USA. They have informed me that they will no longer be shipping to my country. I know absolutely nothing about any other alternative, whether or not I can source other cartomizers, and whether it’s still okay to import them legally. I have a small stock, so not panicked, but it thought it’s probably time to find out more about alternatives. Can you give me some feed-back please. It would be most appreciated.