Other options are available, but you might find $40 USD might be too steep for a simple mouse adapter. If you're not too concerned about compatibility with older hardware banging games, I would suggest spending a bit more money for a Highway(Zorro2)/Subway(clockport) USB adapter which also allows the connection of a wide variety of USB devices including mice, keyboards, printers, scanners, flash card readers, webcams, and more. The cost is about double the cost of a PS2 mouse adapter, but the extra benefits are money better spent.
If you have Mediator I suggest to get Spider USB card. It has five High Speed USB ports (USB 2.0). It is the fastest USB controller for Amiga.
Info from buy.elbox.com website:
The Spider USB 2.0 PCI card provides a simple and affordable way to add five Hi-Speed USB ports to Mediator-equipped Amigas.
The Spider USB 2.0 Hi-Speed PCI controller is backward-compatible, which means it works also with older USB 1.1 peripherals.
Features:
• Four external and one internal USB 2.0 Hi-Speed ports
• One EHCI (Enhanced Host Controller Interface) controller
• Two independent OHCI (Open Host Controller Interface) controllers
• Compliant with EHCI, OHCI and PCI 2.2 standards
• Compatible with both USB 2.0 (480Mbps) and USB 1.1 (12Mbps) devices
• All ports can handle high-speed, full-speed and low-speed transaction
• Supports up to 127 downstream USB devices
• Supplies 500mA power to each USB port
• Supports PCI-Bus Power Management Interface
• Hot Plug Capability
Requirements:
• One free PCI slot
• Mediator Multimedia CD
The package contents:
• Spider USB 2.0 Hi-Speed PCI card
• CD with the Mediator EHCI (USB 2.0) and OHCI (USB1.1) drivers for the Poseidon stack
