Yes, you can buy it from commercial providers like Planet or even Airbus. They update a few times a day, though depending on the place you are interested in, you may need to put in a request for them to image it.

Its actually not that difficult. I used to fly a satellite that could photograph anywhere in the world at least once every few days.

It must be quite valuable data. One anecdote I heard/read somewhere was that firms often use satellite imagery of parking lots (over time, as one measure among others) to gauge how popular a place is. I don't know if it's true or not.