Any reason old xbox (or new) power supplies couldn't be used for rgb strips?
http://www.ebay.com.au/itm/Genuine-Power-Supply-Microsoft-xbox-360-console-14-2A-Aus-Pal-12V-175W-/230779514832?pt=AU_Video_Game_Accessories&hash=item35bb87efd0
http://www.ebay.com.au/itm/Genuine-Power-Supply-Microsoft-xbox-360-console-14-2A-Aus-Pal-12V-175W-/230779514832?pt=AU_Video_Game_Accessories&hash=item35bb87efd0