Starbucks doesn’t publish their bulk prices for obvious reasons, unfortunately. You can find people making guesses online (such as this guy) but for instance he uses Costco bulk coffee prices to calculate and I highly doubt Starbucks is paying that much. Your average small independent cafe is going to be getting their supplies from generic wholesale stores and sites, where you can view prices for cups and things. Hell, I know some places that legit just buy their milk for their cafe at places like Aldi. So they’re paying consumer prices for milk versus the bulk discount a mega corp would get.
Edit for missing period which made an odd sentence.