Is yours the high 1kw output model? If so, the their replacement blade cost is ~25% of the original unit cost. That seems terribly high charge for 3 blades (and hub).
Did a quick search and didn't see anyone offering replacement blades for your unit. It would probably be difficult to make a good balanced set on your own.
Having owned a wind
gen for many years, I still question the worth of the unit in terms of power production and think solar
is a better bang for the buck.
Just curious, do you get a lot of power out of your wind