Vegetable Broth/Stock from Kirkland Organic No-Salt Seasoning
Converting comment to answer.

How much salt could a boulion cube have? Certainly no more than the volume of the cube itself. Generally when you make a broth, it needs salt or it tastes insipid, flat and flabby. Just reduce the salt in your recipe by however much boulion cube you are using and it will balance out fine.