The Angry Viking

I was in Boarders in Blanchardstown today, and was browsing though the computer books section, as is my want on a lazy Saturday afternoon. I wanted to take note of  ISBN numbers of books for 2 valid reasons: 1 I had no cache on me to get the books now, and 2 to check online for cheaper prices. I know the second one is probably rude, but in all fairness to myself, this is Ireland, and everything seems to have 3 taxes on them: 1 vat, 2 Dublin prices and 3 just a tax to get extra money out of you. But I noticed that the ISBN numbers of the books are all hidden by the boarders price tag. You have to get it from the inside of the book. Now, people who know what they are doing will be able to find it relatively easily, but is this an any ISBN finding measure, or am I being suspicious?