To enhance your chances of getting what you from this sale:
1. LOG IN before you begin adding ebooks to your shopping cart. If you take too long, you will be logged out. When that has happened to me, I've been able to log back in and see the things still in my cart.
2. To get around the Wish List problem, add a book to your cart. Then view the cart. There is a check box to the right of the title. Click it and then click Update Cart at the bottom. The item will be removed from the cart and added to your wishlist. (I still think they need to put the wishlist button back on each page.)
3. SEARCHING - go to the Teacher Express homepage before searching. It doesn't guarantee that what you want will be in the results, but it is the ONLY way I've been able to get anything other than a "no results" page.
(My humble opinion: If they didn't want us to use the code, they could disable it. Since they didn't, I don't feel guilty using it.)
I love these sales, but shopping there can be frustrating. Hope some of that helps someone else.