While it's easy to see in unprocessed foods where the sugar or other ingredients are, it's not so simple with processed or packaged food. Read the labels and avoid items that have been known to interact with your sugar.
This insures that if there is a sudden change in your blood sugar levels, you know in advance to address the situation in a timely fashion lest an emergency arise.
Diabetic supplies like monitors, lancets, test strips and syringes and they're carried in bulk at Costco. You can also find pamphlets at both pharmacies with information on Diabetes.