Does a user that register an add, has the capability of setting not a price for the item/service he is posting, but something alternative instead. For example, other product or service in exchange.
The theme by default has a price tag and field for the actual sale price, but there is also a custom form functionality which would allow you to add other fields within the listing if you wished to. Additional customization may be required depending on how you want things to display, however our themes are not encrypted so you are free to make modifications if you wish. Thanks.