Amazon has for Select Accounts: 6-Count Energizer CR2032 3V Lithium Coin Batteries for $7.29 – 5% when you checkout via Subscribe & Save – 20% when you ‘clip’ the coupon on product page = $5.47. Shipping is free w/ Prime or on $25+.

there is also a different version CR2025 3V Lithium Coin Battery (10-Batteries) with 5-Year Warranty for 5.99 for 10 counts