In order to search for items that are currently offered, you can do so by selecting search in your active items page.
After clicking into items, you will see at the top of the program items page, a drop down in the search bar. As shown below.
Type: search by item type, for example, a Periodical, Merchandise or offsite
Marketplace Categories: search by marketplace category
Brand: search by the brand of the item
Keyword: can include category, brand, etc.