Boost regulator from 3V to 14V; then two LDO to make a +5/-5 power supply?
I would use a boost regulator form 3v to 5v, and then a voltage inverter like the Analog Devices ADM8829 or the Maxim MAX1697, about $2.30 in single quantities, to get the -5v.

Both take an input up to 5.5v, and produce a negative voltage of the same magnitude, with an output of either 25 mA or 60 mA which should be enough for op-amps.  They only need a minimum of external components (two caps).  Quiescent current is 600 uA for the AD part, and a few hundred µA for the Maxim part.  Very simple, you don't have to deal with virtual grounds or the like.