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Thanks for all the replies:

18 people told me to use Herb Ox with the label that says msg free
(1 person warned me to not use Herb Ox even though the label says so - she
had a bad reaction)
5 votes for Health Valley Chicken broth in cans
4 for Knorr bouillon
4 for Tones which you buy at Sam's Club (I was told the msg is derived from
corn)
2 for Nitrimax vegetarian chicken broth powder
1 mention each for the following brands:
Maggies, McKays, Spice Islands, Superior Touch, LB Jamisons, Pacific foods
vegetable broth, Knox, Swansons, Imagine no-chicken soup, Edwards & Sons veg
bouillon, Kinnikinick, Wyler, Frontier

Amy G, Chicago, IL area