I have an auto-body wholesale supply in my area. No sign on the door, no advertising, no nothing. Just a plain door on a brick building. Years ago, someone told me to check there and I did. The place has everything! I bought a box of 100. Good thing I did. My interior has come out a thousand times since then.
Yes they all broke because the material there molded with (nylon) will dry out and become brittle over time if its not in a semi humid environment. Before using them add a small amount water with the clips in a plastic bag for 12 hours. Then install them...