Lantus insulin costs about 120 dollars on average depending where your location is at most places can sell generics that are much cheaper than this one. Lantus is a medication
that treats diabetes. You can always to go Petmeds.com so you can see if they can offer a lower price many times they do. Other places can be at your local pharmacies such as Sam's, Walmart or Costco they have great prices. You might also want to talk to your vet about prescribing a cheaper insulin such as Humulin. Animals actually sometimes do better on a less expensive alternative. Most peoples pets or cat live 10 years of the diagnosis of diabetes. So there are choices you just have to go out and look for them.