Yes, depending on what you consider "buying" and perhaps what you consider "owns", and it varies by country.

The practicalities are that the places you can use the "tricks" (like homesteading still being valid, or mining claims, etc) are places where the land is so cheap as to be free (or nearly so, eBay has "land" available for a few dollars, because you pay lawyers $500 for the transfer and the land is somewhere in the Nevada desert).

Practical usable land (for some value of "you could grow things on it, and it's not a desert") seems to put a lower bound in the USA of about $1,000 an acre.

The problem is most people want said land to be within commuting distance of a job, where it jumps to $5-15,000 an acre.