The disk, available for both Macintosh and Windows, costs $199.95.

Extra disks will cost about $160 for a 10-gigabyte unit and $200 for a 20-gigabyte version.

The disks themselves will probably cost between $20 and $40.

The disks themselves cost about $50 to $800.

A 20-megabyte hard disk costs a few hundred dollars.

These disks cost about $300 to $400 each, though more expensive ones are available.

The disks cost $400 to $600; the player about $400.

Mr. Petrone said the disks would cost about $25 each.

Each game has two challenge levels, and additional disks cost $20 each.

Each disk costs about $4.50 and can be viewed for two days - or longer with additional payments.