+1 on the humi pack.
If you can't find one put the cigars in an open zip lock bag, then place this bag in another larger zip lock with a slightly damp (not wet) cotton ball or cloth. Seal only the outer bag, and viola, you just made a humi pack. For more security you can place the bag in a cigar box to prevent your smokes from getting crushed.
Enjoy your trip.
PS...cigar prices in Vegas are ridiculously high, so beware.