I wouldnt get too hung up on the rarity bit. Its only special to a cruiser head,anyone else wont give a rats ***** as reflected in the red book price. A fair price is hard to determine,there is not many 40 series of any type with a good body and interior these days. There was an LX on ebay in tassie a few months back that went for $1800 but it was rusted badly All engine and mechanical parts are easily available but dont expect much from Toyota as they have just about ceased dealing with vehicles this old. I think your mechanic overstated the extent of the cost of taking it to a diesel mechanic. Most of the maintenance is filters and a grease. Once every 4 years take the injectors out and have them rebuilt for $220. Another thing to consider is that these are not suitable as a daily driver. You would be better off having a small cheap car as your main transport and putting the 42 away for the weekends. The 40 series is slow,rough and handlles terrible on road. Brakes are agricultral and the cabin noise is not pleasant. If you try and drive it everywhere you will lose interest pretty quick. This point needs serious thought. I drive a FJ73 with a 1HZ diesel fitted and a HZJ75 and driving them all the time is a chore but they are streets ahead on comfort. For $10k you could get a very nice 73/74 series.(73 have a 3F or 3B and the 74 has a turbo version of a 3B)