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Amazon [amazon.com] has 10-Pk Panasonic CR2032 3V Lithium Coin Cell Batteries for $6.49.
Shipping is free with Prime or on $35+ orders.

Home Depot [homedepot.com] has 10-Pack Panasonic CR2032 3V Lithium Coin Cell Batteries (CR2032P/10BW) on sale for $6.49. Shipping is free.