Amazon has Coin Cell Battery for $0.05 ($0.03 / Count), which is 99% off its original price $5.11.

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Product Description: 2-pack of CR1632 3-volt lithium coin cell batteries ideal for small electronic devices.

• DEVICE COMPATIBLE: Suitable for watches, games, and medical devices.
• LONG LASTING: Reliable performance even in extreme temperatures.
• EASY IDENTIFICATION: Clearly engraved with the battery model