New Zealand has 8G/8G to some homes within bigish cities for around $270nzd/mo (~180usd/mo)[1] and most of the population has access to at least 1000up/500down fibre for about $100nzd/mo (~65usd/mo).

It how ever is not the cheapest country in the world, so it somewhat depends on your definition of affordable

[1] https://www.orcon.net.nz/hyperfibre/