Where can I find the boundaries of coupons / promotional codes really work?

Where can I find the boundaries of discount / promotion codes that actually work? What coupon codes or promotion codes actually work for the border? I have a Gift Card $ 25 Borders $ 1.22 but still need to complete the payment. Does anyone know where I can find a code for use online for do the rest of my payment?

http://www.discountwild.com/Books-plus-Mags/Borders.com-money-off-codes/index.html