After a recent trip to the New Era store in Stratfield (A catchy nickname my cousin gave Stratford Westfield) I noticed this loyalty card in my bag.
I'm not sure when these cards were introduced but they work similarly to other loyalty schemes, e.g. Nandos, after a certain amount of purchases you can claim a reward.
With the New Era Collectors Card, after you have 3 stamps you can claim a free cap brush, after 6 stamps you get yourself a cap storage system and finally after 10 stamps you a free cap is all yours.
Sounds like a good idea to me, so make sure you get yourself one when you next visit a flagship store.