Amazon has 4-Pack Amazon Basics C Cell Alkaline All-Purpose Batteries, 1.5 Volt, 5-Year Shelf Life for $4.13 when you check out with Subscribe & Save. Shipping is free w/ Prime or on $25+ or $35+ orders (minimum requirement varies by location).
Product Description from Store
- One 4-pack of 1.5V C cell alkaline batteries, providing long-lasting reliable power
- Ideal for a variety of everyday devices, including toys, clocks, flashlights, and more
- Improved design offers a 5-year leak-free shelf life; store for emergencies or use right away