Borders Books regularly publishes discount coupons for both Borders.com and Borders brick and mortar stores.  Usually the printable coupons has a promo code on it if you want to purchase a book online and apply the same discount.

Here are the printable coupons currently available:

• 40% Off Any Item List Price Expires 5/30/11: Coupon Code BXG7422N
• 50% Off Any Item Expires 1/2/11
• 40% of All DVD’s and BlueRay Discs Expires 12/21/10
• 33% Off any item Expires 12/20/10

• 40% Off any item – Expires 10/11/10
• Free Borders eBook App Download – Ongoing
• 33% off any item – Expires September 16, 2010
• 50% Off list price of The Mockingjay by Suzanne Collins – Expires August 30, 2010
• 33% Off list price coupon for any item – Expires August 26, 2010
• 40% Off 1 Kid’s Toy or Game in-store coupon – Expires June 28, 2010
• 33% Off list price coupon for any item – Expires June 28, 2010
• 33% Off list price coupon for any one item – Expires May 24, 2010
• 40% off single-disc DVD and BluRay DVD’s – Expires May 20, 2010
• $5 Off coupon for 1 of 4 different craft books – Expires June 30
• 33% Off any item Expires May 13, 2010
• 33% Off any item Expires April 26, 2010
• 50% Off B1G1 Printable Coupon – Expires April 8, 2010 11:49 PST
• 40% Off list price of all DVD & Blu-ray box sets – Expires April 15