I ordered this last night for my iBook. Free shipping is nice.
http://www.buy.com/prod/LaCie_d2_DVD_RW_USB_and_FireWire_with_Double_Layer/q/loc/101/10412127.html
http://www.buy.com/prod/LaCie_d2_DVD_RW_USB_and_FireWire_with_Double_Layer/q/loc/101/10412127.html