Travel Technology - In-Ear Headphone Cord Clips - Where to get?

I recently switched from my Sennheiser PCX-250 noise canceling headphones to Sennheiser in-ear phones. The sound isolation is much better and I can sleep in them easily on redeyes.

There are two things that they are missing. First is a case, which I picked up with a cheap set of $5 headphones. The other is a clip on the cord to fasten it to a shirt/collar. If I move wrong and catch the cord on something, it will pull the bud out of my ear. My desk headset has a rubberized plastic alligator clip that works great for transfering the strain from my ear to clothing.

I can't find these anywere to buy. Any sources?

For my Shures, I took a clip and split ring from a lanyard badgeholder from some trade show, and figured out a way to connect the split ring to the headphone wires.