You can buy those machines, but they are commercial machiens and they are seriously expencive and their processing quality is shit to put it bluntly.
This is wrong, usually these machines are run by shop assistants who know zilch about processing so color and quality would be way off, pro labs use the same machines but are operated by photographers/lab techs etc, these would be calibrated weekly/monthly, they dev the film and not all produce digital scanned prints, the photo paper, on rolls, is exposed to light internally, projected through the neg then the prints pass through the three bath chemical soup and fall out the other end as finished. Print quality varies with operator and outlet, hence garbage prints from snappy snaps unless the machine just got its monthly overhaul.
I would use any of these 1 hour shops for proofs when I used film, all selections by clients would then be hand printed, its far too expensive to proof your own if your a one man show and also far too time consuming, especially 2-300 wedding shots that you wanted to show the punters on the night. H