Where can I find a particular cat toy mouse?

I can't believe I'm posting to ask this, but ok. My cat likes a particular mouse toy. He's gotten it stuck under the fridge and it's so far back we can't get it. He meows pathetically at me whenever I go into the kitchen. I'd like to get a replacemnt but I can't find this type of mouse anywhere anymore. It's about the size of a regular small toy mouse, the kind you can get in bulk anywhere. But the mouse is round and very soft..perfect for kittens because it's not hard at all. It has something inside it that makes a shaking noise. He loved it and I'd love to replace it. Any suggestions or anyone know of a similar toy out there?