Just Hit Highest Amazon Sales Rank Recorded, page-16

Get Travelan needs to advertise in the major international areas of airports and sell in the duty free areas or marts for adventure travellers. India, Africa, south Pacific, Turkey, Mexico, etc.

Get inyo the marts or blogs for cruise ship lines with targets like Caribbean. Advertise towards the young senior traveller.

Partner with Red Cross when disasters strike affecting food and water. In exchange ask for a few
honest testamonials from volunteers. There could be statistics to help assess benefits generally.

Partner with national pharmacies all of these target countries rather than only in point of exit countries like US. Pick the 20 biggest markets for 1st world to 3rd world travel and have add and sales at both sides of the airports.

For all the above no point covering the whole nation of the target market if most people are routed thru airports or bus stations or cruise ports.

Ads on TripAdvisor or Expedia.

See if sales partners will share ad costs at country entry points.

Blogs are good too. Cheapest method. Ok reach.