For comparison, I've paid around $2000 for whole family house project, it's not just plans but also heat-loss computation, heating systems plans etc.
Country CZ (EU). It's two story house made of "bricks", with gas+wood+heat pump heating systems. I would say pretty classical here. For ~$270k, not counting the property.
Also soon there is starting another round of EU subsidies in range of $50k paid upfront for houses with solar panels, green roof etc.