In Taiwan, numerous stores provide rewards points with which customers could earn rewards. Mostly the points were collected in the form of a rewards card. When a customer owns several or even dozens of rewards cards, this point collection system may become very annoying. Therefore, we decided to develop a new system to address this problem. Using mobile devices, such as smartphones or tablets, has become a common and popular phenomenon in modern life. Almost all the mobile devices are equipped with the Bluetooth technology and Global Positioning System (GPS). These two technologies were used in this study for our smart auxiliary shopping system. Instead of using 3G or Wi-Fi networks, users communicate data and geographic information through the Bluetooth Location Network (BLN) we constructed. BLN is a small wireless network formed by eight (at most) Android mobile devices with Bluetooth capability. Since the traditional Bluetooth connection mode cannot realize peer-to-peer (P2P) connection, we adopted BLN to shape a P2P network topology, which allows the designed system to implement fast data upload and download. The survey data showed the satisfaction rate for this system was as high as 81.5%, and 91.3% of people who owned smartphones were willing to install this system. These numbers prove that this system can provide users a more convenient and effective management platform for rewards points.