I recently sold my PS2 with hard-drive package on this forum (here's the thread if you want to take a look : http://www.hotukdeals.com/forums/showthread.php?t=30389http://www.hotukdeals.com/forums/showthread.php?t=30389
Also have a read of that thread if you want to check my 'credentials'.
Anyway, after selling it I realised I still had an extra HD Advance disc (original of course).
I bought my hard-drive kit as a complete package and it seems they sent me 2 HD Advance discs by accident.
Anyway, it's mint, unused and is obviously no use to me now.
Will sell it for £6 including postage to anyone interested (no offers, sorry).
Just so you know, you'll need an old-style (fat) PS2 fitted with a network adaptor and a hard-drive ( most PC drives tend to work, some don't, though you can't go wrong with a 'maxtor' ).
HD Advance is basically the software that runs the hard-drive and lets you add/delete/run games.
Any interest, let me know.
Doesn't come with instructions (the buyer of my PS2 got them) but it's simple to use, and I don't mind helping the buyer over the phone, on the off-chance they have any problems setting it up.
Note that I don't accept paypal, so I'd be looking for payment via post (cheque, postal order, or cash sent by recorded delivery).