Correct me if I am off...but this is about what I paid...
You can get rear OME 912 springs from Rocky Road Outfitters for about $130 http://www.rocky-road.com/vehicross.html , tires??? It depends on what kind you want... and if you are using the same wheels you have or buying new wheels, too. I just got my full size spare for $170 and my wheel to go with it was $80, so figure about 1k for all for tires with wheels plus $130 for the springs for the lift. So, we'll say $1,300, give or take, to factor in shipping costs/taxes.
Are you doing the work yourself? Or are you going to be paying for labor?