PC Fire Wire Adapter

I'm assuming you mean the 6-pin to 4-pin adaptor?

Apple has replacement accessory prices listed here...
http://www.info.apple.com/support/applecare_products/service/ipod_service.html

[[Product]]
[[Price]]
[[Shipping]]

Wallplug
$17.00
$6.95

Firewire Cable
$19.00
$6.95

Headphone
$17.00
$6.95

Power Adapter
$49.00
$6.95

Unfortunately, the 6-pin to 4-pin adaptor isn't there. ;) I'd suggest you call 1-800-APL-CARE... they are usually quite helpful... If you can get them to send you another one, it'll be on your doorstep in 20hrs.

I'm sure 3rd-party adapters are available-- it's totally standard.

Good luck in your search, and...

...if all else fails, send me a PM... I have *3* that I have no use for.