The "best" option depends on whether you have private insurance, government insurance (like Medicare), or no insurance at all.
Sanofi, the manufacturer of Lantus, offers three primary programs to ensure affordability: where to buy lantus insulin cheap
If you cannot use manufacturer programs (e.g., due to government insurance restrictions), third-party discount platforms offer significant savings: The "best" option depends on whether you have
Lantus is a biologic medication. While there is no "generic," there are that are often cheaper: Copay Card & Savings Programs - Lantus government insurance (like Medicare)