To display your products by date of availability, navigate to the "Settings" drop-down menu. Select "Products" to get to the Product Management page.
Click the "Edit" button to the right of the product name you wish to add an availability/expiration date to.
You will see a box pop up that will allow you to edit your product. Click on the availability/expiration drop-down.
Here, you can add a date for your product to become available or expire. If you add an availability date, that product will not be presented to your registrants until that date. If you add an expiration date, that product will not be presented to your registrants on and after that date. Keep in mind that these dates adjust according to U.S. Central time.