I buy the smallest vitamin bottles and keep track of expiration dates. Also, store them on refrigerator after opening.

For multi-vitamins; go to Amazon Global page and in Pet Supplies, search for "reptile vitamins." They have Rep-Cal Multivitamins and also Fluker's ReptaBoost in stock and will ship to New Zealand. Sadly they do not sell Repashy products or Pedialyte.