Is there somewhere I can find a prewritten WebApp (with database) for a used car dealer? The application would need to support the following:

1. Easy setup in a low cost Shared or Cloud Host
2. Give potential customers easy way to browse current inventory (cars on lot) with suggested prices
3. Give dealership easy way to login and update inventory (cars on lot) and suggested prices
4. Give potential customers easy way to send the dealership an inquiry about a specific vehicle on the lot with CAPTCHA style SPAM protection

I prefer ASP.NET MVC and Microsoft SQL Server, but I might consider other technologies such as WebForms and LightSwitch (HTML5). I am reasonably comfortable with MVC and WebForms, but I really don't want to waste a bunch of time writing an application that might already exist.

I did find a few interesting templates via Bing that seem to control CSS and Layout, but I'm not sure if they contain any business logic or if they would integrate well into an MVC App.