Ice age or Alvin and the chipmunks birthday party?

I want to throw my son an ice age or alvin and the chipmunks birthday party and I found some stuff on the internet for both but when I try to order it, it's just plain colored plates and stuff not ice age or Alvin print. I was wondering if anyone knew if they had this stuff at party city or walmart? I want to do one or the other but I want the plates, cups, napkins, the table cloth, the whole nine yard for which ever one I go with. Does anyone know where I can get the packages for either of these themes?