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German low cost carrier airberlin is offering 500 free topbonus miles, simply for registering with European duty free shop Heinemann. You need to do so by 31 March 2015 to get the free bonus miles.

You will even get the 500 free miles if you’re already registered with Heinemann & Me, provided that you have not already logged your airberlin topbonus number with them.

It is well worth being a member of Heinemann & Me. As well as 10% off your first purchase with them, you will receive a €10 voucher on your birthday, every year (with the voucher valid for 1 year). 

A list of all Heinemann & Me outlets can be found here.

Don’t forget that airberlin’s topbonus is a decent frequent flyer scheme, which includes the sporadic – and sometimes outrageously good value – topdeals.

On an ongoing basis, you can also earn 1 mile with airberlin topbonus, Lufthansa Miles&More and Etihad Guest for each €1 you spend with Heinemann & Me. You simply need to state which of the frequent flyer cards you register you want to be your “points-earning” card with Heinemann.

As such, it’s worth signing up for an account and adding your loyalty card numbers to it (and then forgetting about them, if you want): while you may not be a frequent shopper, you never know when you might use it.