FEGLI rates can be found on the OPM website-- they are banded in 5 year age bands and do rise a fair amount as you age.
Generally, you can do better on your own if you are in good health. A 30 year policy for you might be expensive because it takes you past age 70. Consider whether a 20 year policy, which would take you to age 62 or so, would be enough coverage-- it likely is substantially cheaper.
You can price term insurance on a few decent websites (or this guy is a decent agent,
http://www.wealthvisor.com/p/richard-lourie)