If you are looking for a "piece" or physical copy of OS X (now macOS), you can primarily find vintage retail DVDs on marketplaces like or Mercari . While modern versions are free digital updates, older versions like OS X Leopard (10.5) are still sold as collectibles or for legacy hardware support. Buying Physical OS X Media
: Recent versions like macOS Tahoe are free downloads via the Software Update section in System Settings. buy osx
If you meant a specific accessory or replacement part to go along with your Mac purchase: : If you are looking for a "piece" or
For any Mac made in the last 10–12 years, you typically do not buy a physical "piece" of software. buy osx