Oil was in the teens in 99, but never at $6.50.
North Dakota sweet crude (Williston Basin) was $6.50, sour was $4.50. The only people up here who were busy in the oil patch were plugging stripper wells and jacking casing. I also knew a Canadian who was slowing down pump jacks to cut losses because the price was below lift costs.
North Dakota Daily Oil Produced and Price, 1970-present
Note the downtick in price late 1988/early 1999 (drilling also stopped completely for the only time since oil was discovered in the state).
I remember that it went briefly below $10 but I don’t remember how far below. That was repeated in the press over and over.