Is there any college that will give letter grades for transferred study.com courses?

[innen_oda]

It is a capitalistic market, all this only drives students and future job seekers to better options overseas.

I doubt it. The vast majority of universities in countries most Americans would be willing to move to, have already factored this in to their tuition costs (Australia and the UK are the first two which come to mind).
To be honest, I know of very few Americans driven overseas due to the cost of university. Of the ones who have moved overseas, they've either piggybacked on a partner's job/military transfer, or did their undergrad in the US and then moved abroad to one of the 'approved' nations. Or they're doing the TEFL thing for a few years - something native English speakers of all nations do, regardless of uni costs.

As for the 'non-approved' countries (so: the ones with bad PR), even if you do consider the small percentage of Americans willing to move to them, you have to account for the cost of a visa (not just money, but time), the mental costs of being in a new country, and not being able to live at home while you study. Plus potential language issues, not having a social network to help find work or housing, and the necessary savings to get you by until you get settled.

I think your perception of this capitalistic market is slightly idealised, and ignores a lot of externalities of studying overseas, beyond the pure cost of tuition.