Internet based software for an online home buying process, featuring interior design capabilities with real-time pricing that updates as homebuyers select and visualize interior finishes, appliances, bathroom fixtures, window coverings, and other interior features throughout their virtual home, with 3D visuals within an interactive interface, as well as a product search engine capable of producing instant results from a product catalog of finish options such as flooring, backsplash, cabinets, and countertops, enabling homebuyers to include potential design features of their home