Dear All: I'm evaluating buying a Dexcom G4 (read good things -needle comfort, accuracy), and not so good (reliability). The purchase might be out of the pocket. No options -zero- with insurance. My question to you all: Which shop/mail order might have decent pricing for receiver (500 to 600$), transmitters (500 to 600$), and sensors (300 to 400$)? Any tips or advise welcome!