LM257 Boost Converter to 12V

I need a compact boost-converter design built around the LM257 that will take an input anywhere between 3 V and 5 V and reliably produce 12 V. The main objective is simply to raise the voltage—efficiency tweaks are welcome, but only if they keep the 12 V output rock-solid... (Budget: $250 - $750 USD, Jobs: Circuit Design, Electrical Engineering, Electronics, Embedded Systems, PCB Layout, Prototyping, Simulation, Technical Writing)