After the 13week scan we went "pricing" for the big stuff to get an idea of the bits we wanted but didnt actually start buying them till around 19weeks??? Not really sure as we just got things here and there as we saw them or they were on special. We didnt actually get too much new stuff so if it was given it came whenever. We got the last of the "needed stuff" at around 32weeks and just things like shelves or mobiles after that.
Have fun shopping!!!!!!