I have bought the trip insurance offered by the travel agent I used. Not sure who it was thru, and have not needed to use it. I bought it just for the peace of mind in case something happened in the year between booking and actually going! Last summer i went to Africa and booked my trip thru Gracy Travel. The insurance they offered came with a very high amount (like one million dollars, but I can't remember for sure) in coverage that you could use for medical while on your trip. It included the option to be flown back to the states for major medical issues, if you so desired. It also had a option that I bought for a little extra that made the insurance eligible for cancellation for any reason.
Bisch