I haven't had to buy band aids here because I learned my lesson in Mexico. I travel with a well stocked first-aid kit. On a vacation, I stepped on something sharp on the beach and got a small but relatively deep cut on my toe. In the small town where I was there were only two farmacias both had their store sign covered with political posters. Finally found the store. Band aids were sold individually. They did not understand the desire to purchase a box of the things. No elastoplast, just flimsy plastic strips with a small gauze pad with a dried drop of iodine in centre. I bought 20. Blew the guys mind. Due to the location of the cut and my desire to keep the wound dry, I know I would need to change the dressing frequently.
Poor quality, low adhesion, but I had used all of the good one I brought with me. No choice. When I moved here, I cleaned off the shelf in the store at home. Unless I go all ginsu on myself, I shouldn't need more band aids for years.
I have my own sutures, hypodermic needles, antiseptic and dressings, I even have the instruments and compound to temporarily patch a filling that cracks or falls out. I have more aspirin, acetaminophen ibuprofen, codeine and antibiotics than I should ever need to take. I brought 1000 acetaminophen for ChickV which was all the concern last year at this time.
An ounce of prevention coupled with equal amounts of paranoia and hypochondria seems to work for me.
Being able to treat minor wounds immediately at home greatly reduces the chances of infection and keeps me from having to try and figure out just what the pharmacist here is trying to get me to buy and where it came from. I've only been to a farmacia once, and that was to source some Claritin.