We have a couple of places where promo/discount codes can be entered, keep in mind this does not include the checkout page where payment information is submitted. Also note that promo/discount codes can only be applied to new purchases, not on warranty orders or upgrades.
First, click the shopping cart icon at the top right corner of the page.
When the mini-cart slides in from the right, simply click the "+" button next to "Have a Promo Code?"
Then enter the code and click "Apply"
Exclusions do apply. Items already discounted will not be included. If the code is meant to work, it will.
The second area is in the Shopping Cart. In the mini-cart, click "View Cart"
Then follow the process above. Click the "+" button next to "Have a Promo Code?"
Enter the code and click "Apply"