Sadly, the cure is probably in the hands of the shop facility managers, who may need to maintain or replace the floor covering or trolleys. Fortunately there is little risk attached to such electrostatic discharges. In most cases they are just a common nuisance. The biggest risk is that a shock could cause you to have an accidental injury. For example, you might withdraw your arm suddenly and hit it against something.
Many people experience shocks when they get out of their car.
Often they believe that the car is charged - but this is not normally so. Sitting in the car, electrostatic charges are generated on the car seat and the person's body, due to contact and movement between the clothes and the seat. When the person leaves the seat, They take half of this charge with them. As they get out of the vehicle, their body voltages rises due to this charge - a voltage of 10,000 Volts is not unusual. When they reach to touch the vehicle door, the electrostatic discharge and shock occurs as their hand approaches the metal door.