I would throw out and buy new. They really aren't that expensive. Just wait for sale. That is what I do.
Thanks, Mary. I agree with you - throw them out and buy new. I'm not a hoarder just hate to throw out stuff but eventually I wake up and realize that something just have to go!!
When I use a pin and it doesn't slide through the fabric smooth I throw it away at that moment that way I don't keep picking up dull pins.