upgrade 2010 IMAC
I have a 2010 iMac which no longer supports upgrades. There is nothing wrong with it. I am wondering if I can buy a Mac Mini and use the Imac 27'' as a screen? This would be cheaper than a new iMac.
iMac 27″, macOS 10.13
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That setup is no longer supported by Apple. The iMac cannot be used as a monitor for any of the newest Macs and Target Display mode is no longer a feature of macOS, having been deprecated several years ago.
Please see: Use your iMac as a display with target display mode - Apple Support
Per the link above:
• Your target iMac (monitor) must be using macOS High Sierra 10.13.6 or earlier.
• In all cases the source Mac that you're connecting FROM must have been introduced in 2019 or earlier and have macOS 10.15 Catalina or earlier installed.
You might consider a third-party solution - Luna Display or Duet Display - though I can’t speak for the performance of those. Regardless, you still will need a proper monitor to set up either of those options.
Do yourself a favor, avoid the headache and just budget an extra $100 for a monitor. Yes, they are that inexpensive.