Entity Relationship (ER) Model for a general E-Commerce web-application

I'm looking for a well designed ER Model (not a relational model) with proper cardinalities for a general E-Commerce web-application to be drawn in lucid.com. I just need a model which is properly normalized in 1st, 2nd and 3rd normal forms and should have a minimum of 15 tables with well marked primary and foreign keys. I need this by 11th March CST without any plagiarism. If the model is good, I might give the project for development.