Amazon currently has the Neuro Sonic Superfruit Infusion energy drink 6 pack for $5 as an add-on item. It’s by far the cheapest I’ve seen Neuro drinks go for at $0.83/each.
Add 5 and it’s still cheaper than the 12 packs but you get 30 instead and it fulfills the add-on $25 requirement.
https://smile.amazon.co
(The picture is for the Neuro Sleep, but Sonic has the same cool bottle shape but is red.)