Rather than replace my lawnmower blade I sharpened it for basically nothing using an angle grinder and a sanding flap disc I already had. 5 minutes later it's cutting like new. :
Grinding Wheel Sharpening Lawn Mower Blades
Amazon.com: Forney 71921 Flap Disc, Type 29 Blue Zirconia with 5/8-Inch-11 Threaded Arbor, 60-Grit, 4-1/2-Inch : Industrial & Scientific
How to Sharpen Lawn Mower Blades - The Home Depot
Mowing and Blade Angle | Green Tractor Talk
Best Grinding Wheel For Sharpening Lawn Mower Blade - Sharpeners For You - YouTube
Lawn Mower Blade Sharpener | The Garage Journal
Sharpening and Balancing a Lawn Mower Blade · My Busy Retired Life
Amazon.com : Sharpener Model Lawn Mower Blade Sharpener for Straight and Standard Lawn Mower Blades (5000, Red) : Patio, Lawn & Garden
How to Sharpen a Mower Blade With an Angle Grinder | Family Handyman