The use of the Is Available? field in an item saved search is to locate items available in a primary website. Locate and select Is Available? field under the Criteria tab > Standard subtab > Filter column in an item saved search and set it to true.The following are displayed if Is Available? field is set to true:
1. Items with website set under the Web Store tab > Web Site Categories on the item record.
2. Items created after the Web Site and Web Store features are enabled regardless if a website is set on the item record. These features are found under Setup > Company > Enable Features > Web Presence
Note: Regardless if Display in Web Store box is checked or not, the conditions above prevail.