Price filtering is available on the Portal and Widget admin settings, as well as on the admin pages for 'View Events' and 'Reverse Publishing'.
In each case, the setting allows you to display only events that meet a specific price threshold. This is primarily expected to be of use for free/cheap sections or sites, but can be used for any purpose.
Setting the “Price Inclusion Limit” will display only events with any ticket price up to the price entered.
Once a limit has been set, an option to include or exclude events with unknown prices will appear. Keep in mind that not all events have a price specified.