ADoes anyone here use costco to buy stuff for their cake business? The only thing I could find is sugar butter etc not things like cupcake cases I didn't know if they actually did them

The only stuff I've ever seen at Costco from a cake business perspective are ingredients -- the two Costcos near me both sell 50 lb. bags of flour, for instance.

But as for anything else?  No.

I'd be curious to know, though, if they sell buckets of their icing and/or Bettercreme (or whatever they use for Bettercreme) the way Sam's Club does.  I've never asked.  Hmm...