These guys have a number of products that will do the job:

http://www.powersolutions.com/pdfcat/desk/desk.html

I haven't investigated whether or not they will sell in low qty (like singles) and if not, where to get them "retail"

And these guys have more:

http://www.cui.com/srchresults.asp?catky=764537&subcatky=356029

And another: http://www.peaktopeakpower.com/catalogs/meanwell/kwm020b.html (They have more than are shown on that page - ie. with higher current capacity still)

And these guys have some stuff too: http://www.triadmagnetics.com/Catalog/subcategory/plugins.html

From just a few seconds of browsing each one, the secnd link, CUI seem to have the widest assortment of packages. Let me know what more digging through these links finds. My second adapter is at a friend's house and I'm not sure when I'll get it back.

Bruno