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glass reinforced nylon (Polyamide 66, gf30%, 160-140 MPa tensile breaking strenght, Ensinger)

This is what I suspect Harken is using.

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PEEK (plain) costs 205 Euros/kg (VAT excluded)
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BTW -the price tag from wiki is not at all accurate. The price I got was from industrial suppliers from Europe.

The wiki price is pretty much in the ballpark from what I have seen of finished parts delivered to our factories.
What quantities were you asking for?

The cost of design is a one-time cost...

/Martin