I got some catching up to do!
95 Toyota Supra
Rip-Off, sort of. I mean, it's a rip-off, but the cars are getting so rare if you *really* want one I guess be prepared to get raped. According to the add, I'm not sure what you are getting since the guy is basically keeping everything. He's like "Here's the car...except you aren't really getting this car." Well, you are, for a lot more money. Honestly, if you take away all the crap he's keeping the car is probably worth $25K max (unless you just can't find any in your area). With all his crap, meh, maybe another $5K max. So I can see this going for $30K as a reasonable price. $40K is just ridiculous - but again, maybe not if this is the only car available. With the Supras it's usually a sellers market due to low supply and high "cool/car culture" factor. Which may hike up the price. Taken at face-value, I think this is a bit over-priced.
97 Rock Crawler
This is tough, as it is definitely a niche vehicle. My initial reaction to $15K is hell no. The problem is for these types of cars (race cars fit this category too) is that almost always more money is put into the car then the car is actually worth. Now, I don't know much about building rock crawlers, so I don't know if one could price the jeep stock and build it themselves (or have it built) for less money. I do know, that my Mustang track car, if I were to add up all the worth of the parts and tack it on to the price of the car, I could theoretically sell it for something like $6 or $7K. At least. The question is: would anyone really buy my car for that much? Assume someone wants to actually get in to racing, and they want to buy a car rather than build it. Would they be willing to buy my car, a 95 Mustang GT with rollbar, no rear seats, coilovers, etc. etc. for $7K? I think that would be a hard sell. And I would have a customer base of like 2 people. In the country. If neither of them wants to buy it, I'm not selling it. So this may actually be a fair price for a jeep Rock Crawler. To me, though, it seems a bit high.
68 Mustang
That's actually a pretty good price I think. Depending on the condition, they can go for more. I'd negotiate the price based on what shape the car is in, but that's certainly in the ballpark.
96 Cobra 750hp
Nah, too high. I would around $7K or so, maybe $8K max, in that neighborhood. That's great that it's Procharged and has 750 hp, but you never get back what you put on a car (at least not most cars, there are some very small exceptions). I fully believe he's got well over $6K of stuff in that car, if not more, so one would think he could get $11K for it. But people don't usually think that way. They say "it's a 96 Cobra." He says "yah, but look at all this stuff it's got!" And they would say "...yah, but it's a 96 Cobra."