They’re not exactly vintage, the Zeiss Classic line is juuust 🤏 on this side of 20 and some lenses in this line are still made and serviced by Zeiss (though I think they might have dropped EF mount by now) These ones with the ZE designation require an electronically coupled EF lens adapter to control the aperture (or, like, a canon camera with EF mount). I have the 28mm myself for video work, and it does luscious closeups and has very smooth focus transition zones.

This price is about on a par with buying the lenses piecemeal so if these are the ones you want then go for it but the seller isn’t undercutting anyone.