Wiz,
How long do you want these wheels to last? Ten years? longer? And I ask because plated steel will last at least ten years, just like your old spokes.
JB imports will likely have boxes of 12 1/8" spokes in quantities of 144 spokes for close to $18.50. That's enough for four wheels, and if done right you won't have to spend extra $ for the drive side spokes on the rear. If you are looking for cheap that is the way to go.

BTW use a single gauge spoke for the rebuild. Double butting does nothing for a four cross pattern other than make it even softer and even less responsive to ride. Smiles, MH