On Mon, 12 Apr 2010 09:05:51 -0400, you wrote:

>'William Chops" Westfield ' <westfw@mac.com wrote:
>> By the time you pay $3 for the specialty controller chip (Q100 from
>> digikey), and $4 for the specialty transformer (Q100 from mouser; DK's
>> MOQ is 200; neither actually stocks the lower power transformers), the
>> whole thing isn't looking very attractive...

On the subject of DC/DC transformers - I recently did some hunting for a cheap isolated RS485
solution - I ended up with AD's ADM2487 and this Murata transformer : 

http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=782482

Coilcraft do a SMD version ( GA3157) but a little more expensive

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