Heffalump birthday party?

My daughter is a big Heffalump fan (from Winnie the Pooh). I found a Heffalump party set for birthdays, and thought to buy it. However, her b-day is in April, and don't know if by then she will not be interested in Heffalump stuff anymore? For now she watches the movie every day. We live in Serbia, and if we wait chances are we will never find this party set again. What to do?