I’ve heard of hidden menu items. That is, items or quantities which are available but not ordinarily displayed. I vaguely remember hearing of a particular small and cheap tasty coffee at Starbuck’s which is not openly displayed.
The only personal experience I have with it is McNuggets. The menu says they’re available 10 for 5.79$CAN. If you order 20, however, it comes to about 8.70$CAN, which means they go from costing 58 cents to 44 cents each.
Are there other hdden menu items?
Here, I mean to exclude mom & pop restaurants which are simply badly run and forget they offer something until you remind them.