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Retail, despite all the bad news like TJX, continues to use WEP heavily. Retail already historically has had very low margins on their product, so there is little financial room to operate. They are very reluctant to spend $1000 to 1500 for a device, just to do WPA. It is probably less costly to put a firewall up between these devices and their internal network than to throw away existing devices, retrain people, and QA new devices.