Your question is too "open", without telling which languages you are able to speak and the regions you'd consider moving, it is a little bit hard to answer that. Keep in mind that as far as I know the US is the only country that doesn't charge importation duties (tariffs). Therefore, while there are countries with cheap rent and cheap food, everything manufactured (cars, electronics, etc) is more expensive than in the US. You will have to make the math to see if the balance is positive. Just to give you an example from the country I am originally from, Brazil (which is huge, almost the same size of the US), the rent can be cheap or expensive, depending which city and which part of the city you decide to live, and fruits are really cheap. However, gasoline was around $5/gallon last time I checked, cars are two times more expensive than in the US, car insurance was 10 times (not a typo) more expensive than in the US, and car service on the dealership was at least 8 times more expensive.
But, if you decide to live on the cheap, not having a car, eating fresh produce/fruits, walking or using buses/subway, and pick a place where rent is cheap, life will be slower-paced and cheaper than in the US.
Another thing that is cheaper than in the US in any other country is health insurance. In Brazil, for example, health insurance costs less than half without any deductible or co-pay (you may the monthly fee and that's it, all your medical needs are covered).
Another thing you have to put into the equation is crime.
Cheers,
Gabriel.