I could hack up something with some 78L05s and similar, but I don't really want to have to worry about the thermal envelope, and a linear power supply isn't too efficient (it runs 24/7). Being lazy, I don't desperately want to design my own switching PSU. Off-the-shelf power supplies (like for PCs) are for hundreds of watts and have terrible efficiency as such low current draws if they even start. Even mini-ITX are 80W+.
So can anyone suggest a source of a small 10-20W power supply? For example, is there some common consumer gadget where I can steal the PSU? USB chargers might give me 5V at 1-2A, but is there an easy/cheap way to get 3.3V?
Best so far I have is to buy two of these and feed them with 12V... http://cgi.ebay.co.uk/120632238292
Any other suggestions?