Gordon C. MacLeod

I bought my Z car in 1972 and am still driving it. Happily at 83 as a retired surgeon I still enjoy driving it, but unhappily I'm finding hard to get into and out of and I'm hoping to sell it to someone who will appreciate being a Z owner. It has been in California except for 2 years At Scott AFB in southern Illinois and 3 years in Washington DC. so rust isn't a problem. It has 180,000 miles on it, has the original engine and still runs well, but has also the original interior. How would you suggest I learn what it is worth and what is the best way to sell it? I can't imagine how it would work on eBay and is there another way to put it on the market besides Craig's List? I'd appreciate any insights that others have had in selling or buying a 240 z.