Best value for Z9xx series mulching blades

[RoyJackson]

For those of you with Z900 series mowers, what have you found to be the best value for mulching blades...brand, source and price, if you please.
My mower has the 60" deck...

 

[RollingsFarms]

G6 blades are very nice blades for that and they also have greater suction over the oem blades. They're cheaper than the oem blades too! You should be able to buy them through Deere or any outdoor lawn place where mower parts are available.