Lowes.com has Goldblatt 24" rail cutter replacement blade on sale for $.37. Shipping is free for MyLowe’s Members (free to join). Select a store with no units on hand to get the shipping option.
This is another remnant from the Goldblatt clearance that has now been made available for shipping. You will need a rail cutter (sold separately) to use this properly.
https://m.lowes.com/pd/GOLDBLATT-…r/50258185