Homebrew PCBs

I have been using the double sided pcb
stock from Radio Shack and I like this
non fiberglass material since it is easy
to score and break apart, compared to
the boards made of fiberglass which
I have to use a saw on.  Does anyone
have a better source than Radio Shack
for a similar pcb board material?  A little
more copper on the board with be
helpful also.

TIA,

Dave
http://www.infiltec.com/seismo/pcb-home.htm how I make pcbs
http://www.infiltec.com/seismo homebrew seismographs