I know some recommend sewing machine oil as a oxidation preventative for blades (in lieu of camellia oil). I have used and really like the camellia oil, and it's not really that expensive, but here's a link to Singer Sewing Machine Oil that is very inexpensive.

Singer Sewing Machine Oil All Purpose 4oz Bottle Product Detail -- CreateForLess

4 oz for $2.69, and three 4 oz bottles for $8.07.