pure gprs vehicle tracker/ device

RFQ Description

Hi i would like to get a list of GPRS tracking devices that have the following specifications for commercial purposes ie bulk buying:1. The device should have a sim card slot since i want a purely GPRS tracking device2.The device should have a sim card slot since i want a purely GPRS tracking device3.The device should come with software that would enable me to configure the different users using those devices and the tracking.4. If i want to track where a particular car is i should be able to send an sms to the device and get the location of the vehicle as an sms back on my cell phone.5. The device is for commercial purposes so i will be buying in bulk. I would appreciate it if you could send me the potential devices that meet the above specifications, from those products i will pick the one that i see fit and then i will let you know and you can send me the quotation of the product if im buying in bulk.My starting quantity would be 1000 devices, so how much would be the cost of this number of devices.Regards,Faith