Where can I find more of these? *pic* (attachment on earbuds)

[mingcourt]

These came with my Motorola headset and I decided to put them on my earbuds that I use for my CD player...

However, I lost them and would like to know where I can get more.

Thanks

http://img336.imageshack.us/img336/4549/earbuds5kd.jpg

[wanted]

I'd say Ebay, usually people carry random parts in bulk.