A real estate site has a landing page for a particular zip code:
site.com/zip/99999
On this page, there are links which add arguments to the URL, resulting in structures like this:
site.com/zip/99999?maxprice=1000000&maxbeds=3
My question is on using a canonical URL for the pages with arguments. These pages may have lots of duplicate content, so should I direct search engines back to the base URL for the search? (site.com/zip/99999)
A side note is that these pages with arguments could have no listings returned (no listings found) or could come back with listings (then it wouldn't be duplicate), but that can change on a day to day basis.