Cheap vaccines

Wandering casually through the street market, looking at hardware stalls, I spotted a load of vaccines for sale, of several types. Astonished, I looked more closely and found they appeared to have been used and the contents were quite glutinous, though all well in date! And why on a hardware stall?

Actually, they are vials of Bostik glue, cost 8p each (though I suspect that was the foreigner rate).
Another sticky problem solved.