Yeah, I'm checking AARP and other sites, as well.
The premiums aren't too bad. There's only a few things I worry about:
1) one of us gets ill and we have to cancel before we leave - everything I've booked as far as hotels and car is refundable, but the airfare won't be.
2) one of us gets seriously ill and we need to be admitted to a hospital in the USA. (I would have cover, but a huge excess. Daughter would have nada.)
3) something happens and we miss a flight - car breakdown to the airport, etc.
Of all of it, the second is the worst. For #1 we'd get a refund of the taxes, which are the biggest part of the airfare. So we'd really only need in the hundreds of pounds of cover there. #2 could run into the tens of thousands for just a day or two in hospital.... 3) I'd prefer not to think about too much.
Sigh.