From your search results page, using a desktop browser go to Advanced Search page using the "Advanced" link next to the blue search button at the top right.
Scroll down to the "Seller" section. Select "Only show items from", then select "exclude" and enter the seller username or up to ten usernames separated by commas. And then search. You should see search results minus the listings of those sellers.
Bookmark or save the search so you can use that search as a starting point to continue to eliminate those sellers from your results.
