Lantus insulin can be very expensive in the US. Many members order from Mark's Marine Pharmacy. Reputable, real pharmacy in Canada. They only need a prescription. Have your vet give you a written prescription and tell your vet you will shop around for the best price. Ordering Lantus, Basaglar, or Levemir from Canadian pharmacies Get the smaller insulin pen (3ml) for Lantus, not the 10ml vial. You will end up throwing away 1/2 the vial as it becomes less effective and not helping Teal'c anymore. The lantus insulin pens are usually sold in a pack of 5. See if you can find a pharmacy where you live that is willing to sell you a single pen. Sometimes people post on our Supply forum. Craigslist sometimes. Needs to have been stored properly. Ask friends, family, coworkers if anyone would be willing to sell you a single pen.