The Honey Gardens Elderberry is good. I have used 4 or 5 bottles of the stuff probably. I found it best for coughing and croup, but it didnt seem to take the "infection" part of colds down enough, like if my children had really bad infection type colds when they go to their lungs, Oregon Grape Root (alternative is Goldenseal) seemed to clear the infection better.
Gaia herbs has rave reviews on their producst you can certainly try it! Both the Rapid Relief Elderberry AND the childrens Echinacea Goldenseal have good reviews on iherb. Give it a shot!
Also Epicor is my newest thing. Epicor for kids, a very small dosage, but so powerful!
http://www.iherb.com/Healthy-Origins-EpiCor-for-Kids-125-mg-60-Capsules/22372?at=0
http://www.iherb.com/Healthy-Origins-EpiCor-500-mg-150-Capsules/8352?at=0