I buy my strips off eBay (and some are expired) and I test them against a vile of new ones that I keep around. Have yet to find any expired strips that were off the mark. Walgreens usually has a "sale" basket and theyre sometimes in there at a reduced price. I think its a way for the manufactures to get folks to toss their lot and buy more. Google expired strips and its the manufatures that say toss em. Many diabetics continue to use them.