After writing about membership warehouse clubs in Florida, I have learned that, for many, this type of bulk shopping is quite popular. However, sometimes, some shoppers do not like the intrusion of having to stop and show their membership cards. In the spring, I wrote about how Costco members were being required to show membership cards in the food court. And customers have also been required to show their receipts at checkout or at the exit door. And now, some Floridians should be seeing one more level of security – a scanner at the front of the store.…