He also said that prices had been fluctuating every couple of days.

In the weeks and even months before a flight, prices fluctuate.

The price for the engine has fluctuated between $799, $1499, and $4995.

Last summer, the average price fluctuated between $3 and $4 a pound.

Following the war, prices in the car market fluctuated greatly.

There is also an evidence that the price of stocks fluctuated.

Prices may fluctuate, but temperatures here stay high most of the year.

Market systems require prices to fluctuate with changes in supply and demand.

Since then, the price has fluctuated modestly and ended at $20.10 in 2010.

But since the price fluctuates every day, how can he know what he has to pay?