The Dell Mouse is freely available, I got mine for a song on Ebay.
The keyboard is awesome, but sadly no longer made. Its a Dell-branded 'iGo Stowaway Ultraslim" keyboard, has a truly great hinge mechanism and folds down to next to nothing. You may be able to find it somewhere, but last time I checked I couldn't find any. There are lots of cheap HID profile BT keyboards out there, check my thread in the Galaxy S forums - lots of people confirmed various ones working.
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