What is the average price of a brand new, 4 door Nissan?

Well, if you mean new as in their new electirc hybrid 4 door number, it is averaging just over $25,000. There are other newer models though, some I have found that run from around $17,500, $21,400 to around $25,000 again. It just depends on what model you are looking for specificially and how much you are willing to spend really.