In Canada it's $1k/acre and sometimes even lower. But for your plan to have maximum effect you'd have to do some research what land would be best suited because of biodiversity and climate.
In Canada particularly, climate is an issue for growing crops. Wheat takes 100 days to mature. The growing season in the prairies is 110 days. If the climate drops 1 degree Celcius you lose 10 days off your growing season. If your growing season is delayed by cold or flooding, you don't get a crop that year. In the prairies it takes about 10 acres to sustain 1 cow year round. Throughout Canada there are all kinds of restrictions about how many houses and people you can have on your land. The concept of "starter house" and "starter farm" doesn't exist anymore. There is the nobility, and there are the serfs. We just don't call them that.