Here is a procedure to get 20% off your online order:
1. Add the item to cart and proceed to checkout.
2. When entering the shipping and billing address, go to http://app.bedbathandb
3. Continue to finish entering checkout shipping and billing info and go to next page to Shipping Options. The 20% off offer will show in the middle of the page. It gives you the option to use it next time. Mine expires 8/1/12. It has some exclusions, which I didn't check.
If it doesn't work the first time you try it, you may try again with another email. It didn't work the first time I tried, but worked the second time with the above procedure. I used Firefox. Good luck!
Credit to scott78945 for finding it. The procedure worked on ordering the clearance cookware set in this deal: http://slickdeals.net/f/4885984-American-Kitchen-Tri-Ply-10pcs-Cookware-Set-Made-in-USA-Bed-Bath-Beyond-192-tax-Maybe-Shipping?v=1, which is not available in my local stores.