Hi Im new to the board, Im going to speak frankly here and hope I dont break any rules!
I was nursing when I started LAWL. They basically moved me "up" one plan and I couldn't take any of the supplements. So yes, they offer something for nursing moms.
This diet really encourages healthy eating so I believe that doing this would be good for you and your baby.
When I started the cost was around $500 for a year. Look for days that they run "specials". I recently refered my aunt for $199 for a year... you just have to have good timing I supose.
Also, I dont do the bars, Im not sure all centers will let you do the diet with out bars but they were way to expensive for my tastes. They are yummy.

You will get a few free samples.