The trip insurance offered by WDTC on their packages is $66.95 per adult, children under age 18 with an adult are covered for free. Flights are also covered if you purchase from Disney or on your own as long as they match your package dates.
Just an FYI......you can add insurance until final payment. Insurance is non-refundable. If you add insurance at the time of booking and end up not going, you lose your money. Wait until the 45 day out mark and add then if you still want it.