I don't even have a supplier for galvanized spokes anymore. I pay about $16-$17usd for a wheel's worth of straight gauge stainless steel custom cut to length. I still have bikes with the galvanized, the aluminum foil trick works well if the galvanizing isn't too far gone. Depending on the original quality of the spokes they may not have been too smooth to start with. I have had some that were rough enough to cut a finger on if you weren't careful.

Aaron