Isn't it ironic?

We are getting ready for a port visit (YIPPIE!) so there's lots of info getting put out.  First, there are tours being put together that come with helpful  info sheets with great tips like "Bring along insect repellent."  Then there is the mandatory port brief where the ship's Doc cautions everyone to use insect repellent, "preferably one with DEET."  So, what is one item that you can't buy in the ship's store?  INSECT REPELLENT!!!  Even better?  Pharmacies are "off limits" in this port.  Where exactly should I be purchasing this essential item???  I'm hanging my hopes on the street vendors...