Tupperware still makes those same salt and pepper shakers. My wife bought 2 sets of them just a few months ago. Of course, you have to go through a Tupperware sales person to get them too. But these, she found at a Tupperware booth at one of the city street fairs we went to last Fall. She bought up all the woman had!
We wanted them, not so much because they don't spill, but because with that plastic lid closed tight, the salt doesn't draw moisture! They are sealed tight! Love them, love them, love them! We have one set in the house, the other in the trailer!