My friend gave me her stash of Creative Memories binder holders-these have a fold over of plastic to keep the goodies in the "envelope" part, and they have the 3 ring holes for a binder. These make excellent holders for lapbook components.
To be ready for the part of the lesson I simply print out what I need to for our current study, cut them out (it's just easier that way) and store them there, pull out what we need per lesson and pop them back into another one when done, so we won't lose any of them. Neat heh? Only problem is I am not sure these particular holders are still available but I bet you can find something similar. I will see if my research comes up with any good substitute, but check with your local CM associate or look for them at garage sales and such. These are a little gem of goodness-