Is there any source for any of the Kiosk demos? I know several of them have some interesting GameCube betas on them...
By the way, would these count as warez? I know some contain demo/betas...

As they are only demos I wouldn't consider them warez.

You might be able to buy/trade/acquire some at assemblergames....

If you need some of them, I uploaded here viewtopic.php?f=14&t=24857 the ones I have.

Wouldn't these kiosk demo discs differ from the "regular" demo discs verne94 posted? Or are they the same kind?

Thanks, but specifically I'm looking for the following release:

January 9th, 2001
OR
September 1st, 2001

(can't tell which type of date it is)

The earliest demo disc was from October 2001. So you probably meant the discs from January and September 2002. At least the January disc was uploaded by verne94 in the thread which he had written.