General

Control which products you want to filter. For example, if you want to ensure a reasonable margin on high-priced products, you can combine the price and margin filters to check that all products above a certain price meet the margin you specify.
Zero priced checkbox gets all products which have a price set to exactly zero. Can’t be combined with price range filter. You could set Min price & Max price to search for products in that range.

Example

Filtering by Zero priced filter. We have found a product which sells for exactly zero.