I yet wrote that on banggod.com you can find a number of interesting, useful and cheap items for steampunk.
Here you have a selection of key sets, for jewelry or others projects:
18Pcs Antique Vintage Old Look Skeleton Key Lot ( € 5,97)
19Pcs Antique Vintage Old Look Skeleton Key Set (€ 2,58 )
20Pcs Vintage Silver Skeleton Key (€ 6,17 )
13pcs Antique Vintage Old Look Skeleton Key (€ 2,58)
11Pcs Antique Vintage Old Look Skeleton Key (€ 2,15 )