OK, this suggestion is a little "out there" but maybe it's what you are looking for.
Su Tao cafe in Malvern (on rt. 30) is a vegan Chinese restaurant. Their lunch buffet has a wide array of hot and cold items, and while not a traditional "salad bar" (like Ruby Tuesdays?) there are plenty of cold "salads" of different types, tofu stuffed with veggies, etc. And they may have a section which is traditional salad.