I'm interested in these things too. I went into Walgreen's website just to see how far I could get. There was no question about insurance. When it came to the address, I was stumped. I put in the address of the hotel I'm staying at and it accepted and gave me a list of available times. The list included the following 3 days and the first 2 days were completely booked. So I'm thinking you have to plan to book 3 days out and factor in the 72 hours after that.
Honestly, I'm a bit stressed about this and I'm considering just cancelling my December trip. This was to celebrate my retirement.
Boo hoo. With all the other changes (ME gone, G+, extra charges) I think I'll just cancel and hopefully there will be a time soon when testing isn't necessary. I'll lose some points, but at least I won't spend my vacation worrying about getting back on a plane to come home.