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Not all horns will have a piece that size and you'll only ever get one piece from a horn, so it's not a surprise that you aren't finding it easily. I'll have to pull some horns do some cutting and...

I'll have to take dimensions, but I think I can get 1.5 x 1.5 x 3. I've got both native horn and imported horn.

Here's one that came out very nice, I think. :)

http://www.straightedgerazors.com/ebay/meatchopper1.jpg
http://www.straightedgerazors.com/ebay/meatchopper2.jpg