Travel Insurance

I recommend Travel Insurance where it is possible knowing that it can be pricey. So your purchase can depend on your investment in the tour. Compare policies:
www.insuremytrip.com,
www.visitorscoverage.com,
www.travelinsurance.com.

Forbes has updated their ratings on Travel Insurance Companies.  Travelguard is no longer on their list, though it is a popular one. Here are a few popular & more moderately priced:
HTH Worldwide
AIG Travel
C&F Travel Insured
TravelSafe
Travelex
Allianz Partners
World Nomads
Nationwide
Squaremouth (policy to cancel for any reason)
AAA
If purchasing travel insurance remember that they have a time frame involving when you paid the deposit. Their policy will state the advance time to purchase before a final payment of the tour.