On eBay, you need to know a seller's username or store name to search for that seller's items.
If you have done business with a seller in the past, check your purchase history or your feedback to see if you can spot a transaction, then use the link to the seller's profile or feedback page to find the seller's items for sale or to contact the seller.
Otherwise, use what information you have to either search for the seller's items directly, or to search the internet to see if the seller has a web page that mentions the seller's eBay username.
