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Amazon [amazon.com] has 2-Pk Energizer CR2025 3V Lithium Batteries for $3.29 – $1 when you ‘clip’ the coupon on product page – 5% when you check out via Subscribe & Save = $2.13.
Shipping is free with Prime or on $35+ orders.

Target [target.com] also has for Target Circle Members (free to join [target.com]): 2-Pack Energizer CR2025 3V Lithium Coin Batteries on sale for $3.29 – $1 off when you clip the Circle Coupon [target.com] on the product page = $2.29. Select free store pickup where available, otherwise this only ships with $35+ orders.