I find that I get the best recipes from www.cookinglight.com
(you have to register, but it's free and worth the time). They included sauces that are awesome!
As for gravy, once you get to Phase II, you can make your own with mushrooms and whole wheat flour. Yum!
That said, perhaps all those sauces and gravies were part of why you ended up on SBD in the first place. I know that eating tons of ice cream and all sorts of unhealthy things is why I'm here...and part of losing this weight, for good, is to relearn how to eat in a more healthy way. So try to learn some new sauces that are healthy, and stop using sauces where you can to try to cut the calories and fat from your diet.
That doesn't mean losing flavor...just losing the bad fats and excess calories where they aren't needed. You know what I mean?
Check out Cooking light for great ideas. And try cooking with olive oil and balsalmic vinegar...that makes an awesome sauce!
(check out the Balsalmic green beans recipe in the forums...my DH and I love it!)