A number of airports and retailers have Duty Free loyalty programs.  They’re a pretty painless way of getting a better deal.

I’m familiar with the following ones:

Airports:
Strata Club (Auckland Airport)
Changi Rewards (Singapore)
CPH Advantage (Copenhagen)
Frankfurt Airport Rewards
Heathrow Rewards
MyGatwick
My Paris Aéroport

Singapore Changi Loyalty Program

 

 

 

 

Duty Free Retailers:
China Duty Free Group
Duty Free Rewards (Duty Free Americas)
DutyZero (Hong Kong)
Heinemann & Me
Red by Dufry
Loyal T by DFS

Heinemann Loyalty ProgramDufry Loyalty Program

These loyalty programs offer varying advantages, the most appealing of which are discounts – plus joining is free. So, if you’re a frequent traveller, signing up to one or more of them is definitely worth your while.  I’m a member of Heinemann and Me, and I think it’s very good.  They communicate regularly with pretty good offers, but they don’t inundate you with emails.