Publix - Batteries

Did you notice in this last weekends Advantage Buy Flier there is a $1.50 coupon for Energizer batteries? Well in this past weekends P&G there was also a $2 coupon for Energizer batteries. I just bought some for $5.49 minus the $3.50 in stacked coupons and spent about $2 for 4 batteries... Why do all children's toys require C and D batteries? At least right now I can stock up!