In the east it is way cheaper, now if there were teams closer to the Midwest/West the cost would be a lot less.
This is old, but should give you an idea.
http://www.diycollegerankings.com/much-colleges-spend-d1-mens-lacrosse-programs-2/7471/
It is still going to cost $2 million a season with no guarantee that you will make any revenue. Denver made $1 in revenue for a program that costs $2 million, Notre Dame lost money from their $2 million lacrosse program.
Utah's program is going to cost $2 million also.
For just men's lacrosse it will run $2-$1 million, so I'd expect women's lacrosse to cost about the same. I'll go out and say that for UND to add lacrosse they would need $60 million endowment.