http://www.dimensionengineering.com/
Several available voltages ($12) or variable ($15)  $1 shipping.
1A switching regulators in relatively small packages.  There are 
similar devices
from assorted "real" vendors (like the 78ST series from TI), but I 
don't think
I've seen anything at this sort of price point in 1's, shipped.
(from the RC community.)

BillW
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist