Kelvin electronics seems to have them:   kelvin.com
  They are not as well known as the companies you mentioned, but they have
been around quite a while.  They sell a lot of kits for the educational
market.
  Yes, it might be wise to bypass the output with a capacitor, especially if
you don't have a scope to check for oscillation.

Larry A.

On Sun, Mar 16, 2008 at 11:21 AM, Mike S <mikes@flatsurface.com> wrote:

> At 11:01 AM 3/16/2008, Larry Alofs wrote...
> >You can substitute a more commonly available regulator like the 7810
> >or
> >78M10, but you have to mount it face down because the pinout is
> >reversed.
>
> They're not nearly as common as you imply. Neither Digikey, Mouser, or
> Jameco carries a 78x10 in a TO-220 package, only surface mount. For
> stability, you must also add at least a 0.1 uF capacitor close to the
> output.
>
>