I just realized today that hoarding sensors may not have been the best idea. I have a HUGE deductible (around $2000) so once I meet it I place the maximum order for sensors. Trouble is I get 3-4 weeks out of my sensors - and this is only troubling now that I have 2 boxes that expired in Oct 2011 and 2 boxes that expired in January 2012 and 3 boxes that Will expire in April. I never noticed they had short dates. Just when you figure out a way around high costs it bites you in the butt.
I've read a number of people have used expired sensors without a problem so hopefully my last sensor failure was a fluke. 2 days on the arm (my last one on my arm lasted just over 4 weeks) and it failed. All I can do is give them a try....but I'd love to hear if you've had success with expired sensors?