Amazon has 4-Pack Energizer 3V Watch/Electronic Lithium Coin Batteries (2032) for $3.23 --> Now $3.55 when you "clip" the $0.50 off coupon and checkout via "Subscribe & Save" (select "skip immediate delivery and just add subscription"). Shipping is free. Thanks sr71
Note, You must be logged into your Amazon account in order to clip the coupon. Coupons are typically one use per account. You may cancel your Subscribe & Save subscription any time after your order ships.