Bit of a contrast between South AM and Deal, Kent 
I've been trying to choose realistic retirement options. It depends on whether you want to get away from everything, just from something or you wish to maintain your current routine just sans job:
Cheapest option: Ecuador Professional visa $425 income requirement. Pensioner visa $800.
Best middle option: Portugal. Income requirement €760 per month.
Brazil, Argentina around $2000 per month, but I've heard there may be some leeway in individual cases.