Go to eBay.com and sign in if needed
Use the search bar to find an item or category
On the search results page, click Advanced next to the search bar
In the Advanced Search page, find the Sellers section
Enter the seller’s username in the search field
Select Search to view items from that seller
You can also search by typing seller:username in the main search bar
Replace username with the seller’s exact eBay username
Check the seller’s profile page for all current listings
Use filters on the results page to narrow by seller when available