Comment by username111

There is the happy hacking keyboard (the mechanical one is quite expensive and the regular one is hard to find, and usually comes out to ~$100 if not bought from the company).

You can find a few here: http://www.elitekeyboards.com/products.php?sub=special&f...

Those are pretty expensive though.

The typematrix is also an interesting option:

http://www.typematrix.com/