A:AnswerI did lots of research and browsing before I took the plunge.....I googled used 21.5 Imacs and came up with a Best Buy site that had at the time about six pages of various Apple computers from the central east coast area for sale.....Most were I think opened box items and MANY had just the display and no mouse or keyboard or both.....I do not think the savings were that great though.
A:AnswerIt may come with big sur as it was released last year. All updates are free. Big Sur to Monterey has a lot of new features with it. Either OS is fine as they both work on ARM systems like the M1.