The arm is 28781AQ010 and I got it direct from Nissan for $55 and the blade assembly is AY003H25AR unsure how much from Nissan. You will also need a refill I assume.
http://nissan.epcdata.ru/stagea/pnm35/6845-vq35de/body/287/?frame_no=PNM35700538
Also, seems to be a trend with people, someone snapped the arm on my M35. Basterds...