I only need about 5-6 rocks to finish off my rock garden. Where in northern IL would I find these? I'm not looking for big rocks. In fact, just a foot across or so would be fine. Do landscapers carry rocks, and can I get just a few rather than a whole pallet? Someone at HD suggested I just go out in a field and dig up some rocks. Not a bad idea, actually, but it sounds a little backbreaking. Any tips would be greatly appreciated.