Plugin that allows multiple reps to setup site using one database?

I have a business that makes widgets. This business has reps that help them sell their widgets. If someone goes to rep1.widgets.com and buys something from the store rep1 gets credit. If someone goes to rep2.widgets.com that rep gets credit. Both rep1.widgets.com and rep2.widgets.com would be identical sites pulling data from one central WordPress database.

Does anyone know of such a plugin or have a suggestion on how this might be accomplished?