Okay, it is actually what I expected. I would recommend using the initial solution then, it includes much more information.
To answer the original question: the $post->asp_data->content field contains the “description” field as defined by the user on the ajax search pro back-end, I would recommend using that. They can customize the output of that field via the advanced title/content fields feature, which supports displaying the price and other custom field/taxonomy contents. I believe that is what the user expects to see by default.