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A little expensive for blades, but these last a very long time compared to others.

FiskarsPro CarbonMax Carbon Steel 3/4-in Utility Razor Blade(20-Pack) on clearance at Lowe’s:

https://www.lowes.com/pd/Fiskars-…5000207345

https://brickseek.com/lowes-inven…5000207345