That's for sure, I bought a set for a 450 tiller in 2002 for $205.it's TINES not times... Go to your local JD dealer with your wallet out.
I have never had a Deere tine break but I did have a Land Pride tine bend a little.The real pro tip is, don't replace them until they break at the curve.
Another pro tip is, curved tines last longer that L tines.
SR