there's lots of them on the web. an elementary search turned up these, among many others:

http://www.rpelectronics.com/Default.asp?Main=/English/OnlineCat.asp?Menu=/English/Content/Categories/CatM_68.asp%26Detail=/English/Content/Divisions/Div_68_050.asp

http://www.timco-computers.com/acadapters.html

http://www.neodymsystems.com/n_order.shtml

http://www.google.com/search?q=AC+Adapter+%2B12VDC+1A

etc

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30102792, 10 GB, Blue