I go through Jeweler’s Saw Blades like crazy when I make jump rings. Saw blades normally run $13.00+ a piece and can drive up production costs very quickly, so if you seriously produce jumprings for chain and chainmail, here’s a great source for inexpensive replacement blades.
Enco Industrial Supply currently sells them for $5.12 a piece for 1 1/4 blades and offers blade sizes from 1 inch to 4. Make sure you accurately measure your blade before ordering.
Hope this helps!
John

Resources:
A few of my jewelry tools
Organizing Beads And Jewelry Making Tools