You can now buy OTTO 240 volt, specifically developed induction cooktop for AU$ 195. The 110 volt US version will be available somewhere in the middle of 2013. The US customers can buy the OTTO espresso maker now and use gas while waiting for the induction hob. The shipping to the USA is AU$ 155. OTTO itself sells for AU$ 800.
The best position for a gas flame is within 1.25″ radius of the OTTO center. Focusing heat as close to the center of the boiler as possible delivers the best results.