Unfortunately, life insurance companies do use your weight to figure your premium. When my husband and I got ours, I was 3 months pregnant and was also a little overweight. I think I was about 170. His premium is cheaper than mine!! I never have checked into getting a lower premium now that I'm a lower weight. Hmmm....
Anyway, mine is through Banner Life. I'm not sure if you can get a quote online or not.
Oh, and the financial guy that I listen to on the radio says to definately get fixed rate term insurance--not whole life.