Most cost effective way to power a bunch op amps +/-12V supply rails from +5V
One way to tackle this is to implement a boost regulator with two outputs - one inverted, and one non-inverted - such as the TI TPS65130.  It's about US$3 / qty. 1 on Digikey, and you'll probably need a few dollars for passives.



Make sure to have decoupling caps (0.1 uF) and bulk caps (4.7 ~ 10 uF) at each op-amp supply pin.  If you have low-noise requirements, you can set the boost regulator to +/- 15 V and add +/-12 V LDOs on the outputs.