The producer of the CT60 told me, if you want just one of the 68060 with the right Mask it will cost you around 600 $ each !!
If you buy them in masses you could go down to 50-100$ each. That would probably mean a few thousand of them.
He said that he got really lucky getting just 24 of them at a decent price.
100 MHz will also involve watercooling (remeber it`s overclocked by 100%)
Have a look at this page were you can see such a setup for a Falcon with the CT60 installed (scroll down)
http://perso.wanadoo.fr/didierm/falcon-e.htmWe are far better off waiting for the coldfireproject to get finished. Although the Coldfire lacks an FPU is will be fast enough that it will still beat an 68060 by far.