1. A method of providing an on-line interactive computer price discovery system, the method comprising: receiving, by a processor of a computing device, securities market information from two or more external sources, wherein securities market information from each external source is provided in a real-time data feed, time-delayed data feed, or batch data feed; receiving, by the processor, securities market information from one or more users of the interactive computer price discovery system, wherein information received from the one or more users includes data identifying users with whom the information provided may be shared; storing, by the processor, in a database, the securities market information received from two or more external sources and the securities market information received from one or more users of the interactive computer price discovery system; receiving, by the processor, a query for securities market information related to one or more securities, wherein the query is associated with a user of the system and includes a securities identifier; retrieving, by the processor, from the database, securities market information responsive to the query, wherein the retrieved securities market information includes the securities market information received from two or more external sources and the securities market information received from one or more users of the interactive computer price discovery system, and wherein the retrieved securities market information comprises one or more members selected from the group consisting of: securities data, a price, a price source identifier, a price source date, price source data, source identity information, price time information, permitted price user identifiers, price user data, and price user identifier information; providing, by the processor, for display on a graphical user interface, the retrieved securities market information, wherein the retrieved securities market information provided for display on a graphical user interface is updated as securities market information responsive to the query is received from external sources and users of the system.