I am looking for a "Conductive Pen" that won't cost me an arm and a leg.

This item is basically a conductive type "paint" where you can repair
circuit traces and such. I have to make some new traces on a mylar type
material, so I can't use jumper wires or soldering. I thought Radio Shack
sold them in the past, but could find no references to it on their web site.

I have looked on Mouser, who does have the item, but costs about $16 + S/H.
I need enough for about one use. Anyone got a new or good used one that they
could send me cheap? I just hate to pay more for the repair tool than the
item I am repairing is worth. I'm also open to other ideas (hobby paint
containing nickel perhaps)?

Thanks,
-Commander Dave