I'd like to get a couple hundred or so of those plastic dummy insert cards to use as box fillers for some of my hand collated sets, but haven't had any luck finding anywhere to buy something like that. Currently I'm just using foam blocks to fill the empty space in those boxes, but I'm not too fond of using that. Does anyone have any other suggestions for stuff to use as box filler?
Edit: I've tried several other things before, but wasn't too happy with any of them. Tried wadded up paper, packing peanuts, puzzle piece cards, sticker cards, and hologram cards from a bunch of the old junk wax products, cut up cardboard, and probably a few other things as well.