Insulin and Vit D are bargains (plus there are monthly/holiday specials make them even cheaper) The comprehensive wellness package is always a deal.

Jean, you buy the tests on-line and have the "order" from DL's doctor back to your account in a few hours. Then you go to the LabCorp service center whenever it suits you on a walk-in basis. If there is a holiday sale, I may buy my next Vit D test months in advance. If you occasionally visit this town 50 miles away for other reasons, you could combine the visit for the blood draw. Once DL has your $, they don't care if/when you ever use the order