A search on Ebay suggests there are donors available (some at eye-watering prices) but it's obviously a lottery and may require a couple of iterations to get what you need. Has anybody explained what exact parts are required? I can see, for example, one in the link below but if your mate's watch also has a calendar issue etc...
https://www.ebay.co.uk/itm/176326907041
Best to set up some Ebay saved searches and be patient - I'd certainly struggle to pay low hundreds for a loose quartz movement. Also maybe watch some of the Japanese reseller portals.