A greater saving trick I've found out recently, with even greater gains than saving on cigs is not buying cigs at all.
Furthermore, the medium in question (passenger flight) places practical limits on volume, and raises likelihoods for getting caught. E.g. a large suitcase full of cigarettes is much riskier through an airport, than the same amount of cigarettes tucked away among a lot of other stuff in the back of a 1 ton truck going over the border.
Usually this is near-impossible to enforce, but attempts to organise/aggregate these (which I initially thought this site was going to attempt) do raise your odds.