1. An algorithmic-based system for facilitating a sale of a used vehicle to a prospective purchaser during a pre-gray period or gray period, the system comprising: one or more computer readable storage devices configured to store a plurality of databases comprising: one or more price databases configured to store historical and/or current market pricing data corresponding to a plurality of completed used vehicle transactions and/or current used vehicle listings; one or more vehicle profile databases configured to store a plurality of vehicle profiles corresponding to a plurality of vehicles that will become available on an availability date, wherein the availability date is temporally remote from a present date; one or more purchaser profile databases configured to store a plurality of purchaser profile data, the purchaser profile data comprising one or more of financial data, desired vehicle identification information, and contact information corresponding to a plurality of prospective purchasers; one or more computer readable storage devices configured to store a plurality of computer executable instructions; and one or more hardware computer processors in communication with the one or more computer readable storage devices and configured to execute the plurality of computer executable instructions in order to cause the system to: determine a minimum listing price for a target used vehicle based on a consignor sale price, wherein the consignor sale price is obtained from one or more consignor used vehicle databases; determine dynamically a market price for the target used vehicle, wherein determining the market price comprises analyzing the historical and/or current market pricing data for one or more of the plurality of completed used vehicle transactions and/or current used vehicle listings for vehicles having analogous characteristics to the target used vehicle; calculate dynamically, by a vehicle listing price engine, a unique listing price for a prospective purchaser, the vehicle listing price engine configured to dynamically determine a plurality of unique listing prices, each unique listing price of the plurality of listing prices corresponding to each of the plurality of prospective purchasers for each of the plurality of vehicles, wherein the calculation comprises: analyzing purchaser profile data to determine lower and upper threshold pricing levels for the prospective purchaser; comparing the present date with the availability date; based on the comparison of the present date with the availability date, setting the unique listing price above the minimum listing price and below the market price; and wherein the difference between the unique listing price and the minimum listing price is lower when the present date is relatively temporally remote from the availability date, and the difference between the unique listing price and the minimum listing price is raised incrementally as the current date approaches the availability date; and transmit electronically a dynamically generated computer notification, the dynamically generated computer notification displayed through a dynamic user interface to the prospective purchaser, wherein the dynamically generated computer notification is configured to activate a remote subscriber computer and to enable connection via a URL over a computer network connection to a data source comprising data about the unique listing price, the dynamic user interface configured to display updated market and pricing information; and receive, over the computer network connection, an electronic confirmation from the prospective purchaser, wherein the electronic confirmation activates access to data for purchasing the target used vehicle, wherein the data is accessible only by the prospective purchaser.