Caffeine is a requirement to deal with Costco.
Mainly for dealing with the *people* at Costco but that's another story.
Press has got you covered.
I haven't ventured much beyond their incredibly potent and smooth cold brew, but damn ... With a boost of caffeine that could rival cocaine itself, it's the perfect pre (or post) bulk shopping battle fuel.
It doesn't need cream and sugar or other additives.
Slightly hipster vibe, but don't let that deter you - Every barista I've encountered has been friendly enough.