Coupon stamps at the grocery store

I remember as a child my mother collected stamps with each purchase, which she then pasted into a book and turned in later for discounts.  In Bangkok, the practice is alive and well - here's Sam saving up for discounts on a Snoopy watch, and said watch, after she got enough.

Carrefour is an excellent grocery/department store, by the way.  It's French, but serves up the goods a la Wal Mart quite well in Asia.  Hurrah for Carrefour!