This question is too unspecific. It will depend on the type of plank, where in the world you are, and wether or not there is a lot of wood in your area or not. This question really needs to be reworded. Also, if there is a Home Depot or lowes near you just check there, they sell all kinds of wood planks there
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It depends on the type of wood, the grade of lumber, where you buy it, the size of the plank, width X thickness in inches, and length in feet, and the price could vary if it is pressure treated. You have not provided adequate detail to provide a more specific answer range. It is like asking how much does a car cost; which ranges from free if you take it away, to more than a million dollars. Why do you ask?
A 6 foot oak plank costs about $20- $25 depending on where it is purchased. Some companies that sell these are: Home Depot, Houzz, Hull Forest, Colonial Plank Floors, pioneer Mill Works, to name a few.
Costs are very variable as wood flooring comes in various qualities.
It can be as little as a few pounds (or dollars) per square metre.