Market Products display

The Application provides for several ways to sort the products:
– By Popularity
– By Average Rating
– By Latest
– By price – low to high and high to low

Is there a way to include some sort of code to “Randomize” the products shown when you open the page? Some vendors are way down in the pages results and would like a way to mix it every time there is a new search.
Thanks.

The page I need help with: [log in to see the link]