Bower 85mm f/1.4 lens for Nikon (manual focus, aspherical IF, badged also as Samyang, Polar, Vivitar):
The lens sells for USD 350. If you are lucky you can find it on Amazon for less. FYI the Nikon AF version sells for over USD 1200. The manual focus Nikon 85mm 1.4 (discontinued) sells on eBay for over USD 400.
Some reviews of this lens: