If you own a Nikon Z camera and still have a bunch of older lenses from other brands sitting around, K&F Concept's new line of Nikon Z lens adapters, which will start shipping on January 22, could be worth a look. They could give your old lenses a new lease on life.
In total eleven different Z-mount adapters will be available:
KF-FDZ for Canon FD mount
KF-EFZ for Canon EF mount
KF-PKZ for Pentax K mount
KF-NGZ for Nikon F mount (G-type)
KF-NFZ for Nikon F mount
KF-CYZ for Yashica-Contax mount
KF-OMZ for Olympus OM mount
KF-AAZ for Sony/Minolta A mount
KF-SRZ for Minolta MD mount
KF-42Z for M42 mount
KF-LMZ for Leica M
The adapters are made of brass and aluminum and manually operated. They're also pretty affordable, with prices ranging from $30 to just over $60. You can find an overview of all adapters with more detail on the K&F website.