Hi,
I doubt you will find isomalt in chicago. You may want to call the local pastry shops or restaurant to ask about availability.
Isomalt is not really a substitute for sugar, it's not very sweet. It is wonderful for making clear windows for gingerbread houses. For this application it has a shelf life; After a year of careful storage, it begins to color a low temperatures.
Sweet Celebrations is now out of business. We now order from L'Epicerie,
http://www.lepicerie.com/catalog/catego ... age_1.html Tim