That's a significantly larger gap than what I see here at my local Lowe's. We have electric and gas stoves both about $550 at the cheapest. The gas one is $10 cheaper, not much of a price point. The induction one is $850 at the cheapest, so about 55% more expensive. That's definitely not the 3x cost difference you see here.

I can only get close to those numbers you quote by selecting a high-end induction stoves. They don't sell gas range or oven only for less, but I could see that being a cheaper alternative. Also, their search is weird and I had to specify gas to find gas stoves.