Yeah, I had a lug pin broke off for 2 years. I wasn't driving the car then so I never noticed, my other brother's and my sister were.
I first went to Nissan Dealership and asked them how much it would cost and how long it would take to get in. Greg, who works at the service counter, said they can fly it in for the next day. He told me if I can't find anything locally he'll do that for me. I looked around at all the local part shops and those exclusively for imports. I even visited Canadian Tire (who get their parts from Nissan, especially wheel pins) and they had nothing in the computer system for the other 3 Can. Tire's in the city. I called Nissan, talked to Greg and he had it flown in. I ordered a pin/stud and lug nut for a total cost of $6.83 CDN. If I had my time back I would have went to Wal-Mart for the lug nuts (pack of 4) for the price of the one I got at Nissan.
...anyway
loosen the lug nuts, raise the car, take off the nuts, remove the tire and hammer it out. That's what I did anyway. I just put the new one in and hammered away. Make sure it doesn't go in on an angle though. Took a total of 10 minutes I suppose.
Someone else had this same problem, I'll see if I can find what another member of the forum said.
Greg