Feature Suggestion: Buy X get Y.
This was previously supported by a lot of Lightspeed customers on the previous Ideas page. I am submitting it here to bring this back and get it onto the development roadmap. I do not understand why this was originally not implemented. This is a standard feature of POS systems. I am sure other people have other use cases but below are some examples I would use.
Buy 2 items get 1 free.
Buy 3 items get 4th one 50% off.
Buy 2 for $60, 3 for $90. Singles are $35