Borderline ethical

I found myself at the local Borders last weekend, seeking a book I wanted to read (B1) and a book I wanted to buy (B2). The prices were $20 for B1 and $25 for B2. I was willing to wait another week or three before buying B2, so I just bought B1 and was rewarded with a book discount coupon (C1) and a beverage discount coupon (C2) to be used within the next eight days.

Having read (and enjoyed — thanks, JKR) B1, I brought it back to the store this weekend to exchange for a copy of B2. Amazingly enough, the clerk applied C1, reducing B2's price to $18! Faced with the unexpected situation of having surplus cash in the amount of $2, I celebrated with a nice mocha beverage that it paid for, after an application of C2.

Sorry, were you expecting a moral?