The price all depends on how desperate the people need to sell. Price also depends on which documentation they have; old paperwork or updated by the owner and the land department. My wife has bought land cheaper than it should have been because of old documentation held by land owner. Still don't fully understand how the documentation works here.
We looked at about 3 to 4 rai of land and the asking price was 800,000 baht. It was farm land, level to the gravel/clay road, close to a small village, so had electricity and water connections, and about 3kms from the main town of Ban Kruat.