cant speak for the north, but down here if you buy outside the city a little bit and choose smaller roads with no schools/mcdonalds type things on them, they are cheaper.
Does anyone know if foreigners can buy land? My wife tells me know, but I know she has not asked anyone but her parents...who had not even seen a foreigner until i came around
around outskirts of pingdong you can get a 2-4 floor house (the townhouse style) for 600,000 (fixer upper) up to 6,000,000 or so for a nice looking new one. my inlaws just bought one (check court sales for cheap housing) for 720,000 and put another 1 million into it and its a lovely little house totally redone right down to the brick work.