Some cameras allow what is called 'tethered shooting' whereby you can preview the camera image on your computer monitor, giving a much better impression of what the final photo will look like than on the tiny camera preview screen.
Unfortunately, most such cameras are very expensive and come with lots of features I'm not interested in. So I'm wondering whether it would be cheaper to buy a webcam which can take camera-quality photos (i.e. static images, not videos). Do such things even exist? If so, where?