I've never used Savory, but I've seen it listed in some French recipes.
Personally, I find Celery seed to be to bitter for my taste. I've used Celery Salt, but I have issues with buying flavored "salt". I tend to make my own seasoning mixes anyway.
I've found Dried Celery Flakes, from McCormick, at the spice section in grocery stores. I've ground the chunks up to a powder, and use that in some of my own spice blends for a good flavor.
Usually, though, if I want the celery flavor in my food, I'll diced some celery and add it in. I always have celery one hand.
Peace, Love, and Vegetable Rights!
Eat Meat and Save the Plants!