Yeah, a lot of them are rusted away. I started working for Nissan in 1985 and remember them well. My brother in-law had one just like that. They used to sell new for around $17,000, about the same price as the 300ZX at the time. When Nissan issued the voluntary fuel injection recall back in the early 90's, we would see this coming in one after another with 300,000+ miles on them! You're a little to far away from me, however. Hopefully, you'll find someone soon!
You can try Ebay Motors. You'll get a lot more exposure, but they do charge a fee if it sells. Or, you can try posting on some Maxima-specific forums, like Maxima.org, where you know there are a lot of Maxima fans.