Noctua - Redux PWM Ultra silent

I have 6 fans in total:
2 Noctua - Redux PWM NEWS (15)
2 Noctua - Redux PWM POCO USO (12)
1 Cooler Master 1200 RPM NEW (10)
1 Tuf Gaming 1500 RPM NEW (10)

If you want the 4 Noctuas, I leave them at $45.
If you want the 6 fans, I leave them at $60.