Bit of a bugger that there-s no Wal-Marts here in Oz -
I get much the same thing at electronics stores - not the Tandy/Radio Shack sort of place, but a real electronics store - one that sells every type of electronic component that's made so people can assemble their own stuff - -
They sell tiny strands of colored insulated copper wire strands 140mm long with 25mm of the insulation stripped off each end - the strands are only 0.5mm thick - perfect for 1/24 scale cars. They come in black, blue, yellow, red, green and orange. Have a look for them.
Cheers.
LeeTree