Of course the cost will be different between the UK and the US, that doesn't surprise me...
As for NY I have no idea. I am just telling you what it gave me for Atlanta, and, as I said, several of them included high deductibles which you have to meet before the insurance 'kicks in', so to speak.
I wasn't vouching for the companies on the site, just trying to give another perspective that is different from the several thousand a month a poster above mentioned. As I said if you are truly looking for a temporary solution then getting catastrophic, so to speak, coverage is probably the thing to do, so if something bad happens you have coverage.