Baking Soda

Ever since coming here, my mom has been going around looking for some baking soda, to no avail. Well, we have found it now, and in the most unusual place. Rather than being found inside a regular grocery store, baking soda can only be found in pharmacies. Strange isn't it? Why would something like this be found in a pharmacy of all places? Talk about a mystery wrapped in an enigma and encased in a riddle. What other hidden oddities are there here?