$275 inc. shipping and PayPal in contiguous USA. Current cost of this cable is $125/m/pair, so this 5 m (16.5’) pair would cost $625 if new.
See https://www.naimaudio.com/product/nac-a5 for specs. This cable was a long time fixture in Art Dudley’s system. (Listening #80 | Stereophile.com) Also reviewed here: http://tomtomaudio.co.uk/reviews/NACA5%20speaker%20cable.pdf
Naim designed their amps so that the cable was part of the circuit, but you needed a certain length (hence these are 5m long).
I can take off the spades and provide Naim right angle connectors if you prefer.