Dual shaft dc motor supplier

Can anyone direct me to somewhere I can get a decent dual shaft dc
motor? I am planning on putting a US digital encoder on the back and
using it as a servo for my machine, which is a mini mill like this:

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=33686

I really need something pretty cheap as I am new to this and just want
to do some initial fooling around.

I was looking at something like the following:

http://www.surpluscenter.com/item.asp?UID=2007080312101399&item=10-
2326&catname=electric

However, that is not dual shaft, and still seems a little overkill to
me.

Any help is appreciated!