How much does minecraft pc cost? And is it just a one time purchase?

It costs 26.95 dollars and you can re download it as many times as you wwant. The worlds you make are not cconssitant throughout all of the different computers, if you make a world on one pc it will only be accessable on that pc

It costs 27$. You purchase it once and can redownload it on any computer anywhere as long as you are logged in