Walmart offers the UPG AAA Heavy-Duty Battery Value Box 50-Pack, model no. D5323/D5923, for $6.97. Opt for in-store pickup to avoid the $5.99 shipping fee. (Amazon charges the same with free shipping for Prime members, although it won't ship for two to four weeks.) That's 14 cents per battery and tied with last week's mention as one of the lowest per-unit prices we've seen for AAAs. (It's also the best deal we could find for this pack by $8.)