• Accessories
• After-market purchases
• Annexes
• Appendages
• Enhancing accessories
• Extensions
• Extra charges
• Extra units
• Extras
• Home improvements
• House enlargements
• Optional components
• Options
• Peripherals
• Riders
• Riders, e.g.
• Sales taxes, e.g.
• Scanners, PC cameras, etc.
• Seat warmers, CD player, et al.
• Supplements
• They're not standard