I noticed the last time I went that the salad bar (at least by us) charges $6.99 for unlimited trips yet it's $1 cheaper, $5.99 for one trip only. I have not been to chuck E Cheese all that often but I usually just order salad bar. They seem to automatically charge you the $6.99. I realized that even though I always go there famished, I have never been back for another trip to the salad bar (plus I don't think they give you another plate, maybe they do if you ask? Anyways, my plate is so yucky that I wouldn't bother). I will start asking for the one trip salad bar and at least save a buck.
Good luck on the coupons. We just find them in our local Sunday papers almost every week. I also get the email coupons and they are usually about a buck cheaper. However, most of these coupons are for larger parties (large pizza and 4 sodas...usually it is just me and my DS).
Good luck!