| yay!! i absolutely love my sensors. i've no idea about shelf life though, sorry! it takes me about 3 months to get through a box of 10 (i keep mine in for 9-12 days with a transmitter recharge at day 6 or 7) and I've never had any accuracy issues, so i'd say they last at least 3 months...this is a very unscientific assessment. i'm also stockpiling mine...get a box every month as i've had a lot of issues with insurance and may be changing insurance again in about six months - my husband asked me this very question this morning, so maybe it's time to actually find out.
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Gretchen
MM 522 pump (blue) since May 2007 (RIP Becky (07/25/09), long live new blue Becky II)
CGMS-ing since November 2007
DXd April 1993 @ 30 years of age, Type 1
A1Cs: 7.4 (12/07); 6.6 (03/08); 6.0 (06/08); 5.8 (10/08); 5.8 (02/09); 5.7 (07/09)
"I slit the sheet, the sheet I slit, and on the slitted sheet I sit." - Navin R. Johnson, The Jerk | 
