A method for having a mobile price transaction system including comparisons. The system obtains information about prices and transactions involving products and services in real time over a wireless link. The actions include making a price comparison inquiry to a central server for the product, service, or price information. The inquiry is formatted in the central server for transmission to sources of the information such as vendors or their web sites. After receiving a response from the sources, the response is suitably formatted and is displayed on the mobile unit. The information will often be available locally on the central server, but the present invention includes commanding remote sources to provide an action such as a response, including a response at a desired time or for desired conditions.