Give a line to Steve Frizza. I know hese interstate to you. He runs a lab and likely networks with others who may have a stash.
I downsized to about 100 around last Christmas, but not before giving the tops of the containers I tossed to the recycling bin to the local cubs troop. They use them to make wheels for a science experiment night where ballons and empty water bottles and the 'wheels' mounted on nails or toothpicks for axles tunrns the whole contraption into a mini jet car.