Back in the early '80s, I bought a brand-spankin new Toyota Starlett for $5000. 5-speed on the floor, 54ci, not much under the hood, but not much to fail, either. That thing was rated at 54MPG !!!!
I even put a tow hitch on it to tow around my 14ft Jon-boat. Ran great! I had it for 10 years, 150k miles. NEVER a problem. Sold it to a friend of mine, who drove it for another 150k miles. The only thing that ever failed on it was the starter actuator spring. The body panels were beginning to rust away the last time I saw it, but it was still running great.
Having said that, 10k seems to be a little high for a 1999 Landcruiser. You should be able to get a couple thou knocked off that, by telling him hyour going to have the engine overhauled, or something like that. Look for any leaks, and any issues under the vehicle. Sounds like the body is in great shape, but if it breaks down, that nice body is not going to count for much.