Switching to electronic cigarettes (aka vapor, or vaping) was one of the best investments I ever made. I do not recommend this product if you are not already a smoker or otherwise addicted to nicotine. But if you have tried to quit, and found it difficult or impossible, this is an excellent way to reduce the harm, and likely reduce your expenses as well.
I buy my refills from Vapor4Life. They have great products at great prices. They always ship fast and their products are always of a consistent quality.
But feel free to shop around and try some others!