I use access america. you can get a quote on their website. it is based on age, & cost of trip. (assuming you are not going for more than 21 days).
They offer a really good family plan where kids are free. We get this plan even though we do not have kids. It is myself (37) and my mom (64). total cost of insurance for the two of us was $99. It even covers you for a rental car too.
The only thing this plan does not cover is if you have a connecting flight and miss it. If you have a connecting flight you might want the classic comprehensive plan.
If you purchased
travel insurance from 14 days of your deposit than pre exisisting conditions are covered. If more than 14 days you are not. We bought it because my dad has M.S. (he is not traveling with us and am taking mom away for a break). But, since we bought it within the 14 days if he has an illness even though he is not traveling we are covered.
When getting a quote put in the total cost of the trip including airfare, land portion, etc. Then they will ask you how many travelers and their ages. It will automatically divide up the total cost of the trip per passenger to give you a price. So say the cost of the trip is $4,000 and there are 4 passengers. That gives a per passenger rate of $1,000 so you are only buying coverage for the adults at the rate of $1,000 per adult.
they are also really good at paying out claims...