Price comparison software

I need an easily customizable price comparison software to install on a price comparison [login to view URL] website is intended to offer price comparison service to visitors and also benefit merchants in tracking price trends among their [login to view URL] I give a list of features and components that should be included. 1. Visitors should be able to access items from all the listed stores/Merchants for comparison easily. 2. Visitors should have an option to search for just one item and compare the price or create a shopping list whose entire content is searched and the total cost from all the listed stores given for comparison. 3. Visitors should be able to search a combination of different stores/Merchants with the cheapest prices for items comprising a visitors shopping list. 4. There should be a budgetary feature that a visitor may opt use to preset shopping [login to view URL] exhaustion of the budget when creating a shopping list,this feature should alert the visitor that they have made orders beyond allocated funds. 5. Provide a feature that tracks a visitor's spending trend and create a record against which ones expenditure can be analyzed to help a visitor review spending habits. 6. There should be an area for visitor's registration, discussion forum and link to all listed stores/Merchants. 7. Em bend Google maps to enable visitors identify location of stores and those in their proximity. 8. Provide a facility to allow a customizable interlude between the time a visitor submits a request for processing and when the results are presented. During this interlude, a video clip may be run. Do also provide for the option of running other video clips preferably upon logging in and at the end of each session. The administrator should however be able to edit,enable or disable these features. 9. Provide room for other adverts like Google ads. This software should be able to run smoothly on all OS and all mobile devices. We welcome your suggestions that you feel will make our website effective, comprehensive yet easy to navigate.