Is sort of a responce to the staples thing. I found this other deals site. www.hotdealsclub.com Anyway he is using a script that basically removes the refering site info before sending you to the website. This ensures that the site getting the linke..ie Staples does not know where it came from.
When you put up a link to a coupon code or deal the website records where the person clicking it came from. Hence, and I don't know if this is true or not, why Staples knew you had these coupons up there. By adding this stealthclick type code other sites who might oppose having the coupons up would not know and hopefully would not be a problem in the future. Check out his site. Maybe if you contact him he will let you have or give you an idea how to make a similar script.