40 x Duracell AAA alkaline batteries for $25.95 with shipping from Catch of the Day
I see Deals Direct also have a daily deal going on these size batteries, however this is for a 48 pack which costs $35.90 including delivery. But this means on a per cost basis Catch of the Day's deal is better at just $0.64 per battery compared with Deal Direct's $0.74.
Just as a matter of reference, I could also see online that Coles Online and Bunnings were both charging between $9.50 and $11 for a pack of 10 of these batteries. Just underpinning the fact that the Catch of the Day deal is a good bargain.