Point of Sale Module?

I'm helping my neighbor bring technology to his little family owned coffee shop. Right now he is using a basic register that pretty much only does the math for you and doesn't really have a website.

I have the website under control, however, I'm wondering how I could bring a drupal based Point of Sale software into his shop as well. Right now, everything they do is tracked in a notebook. He really likes the idea of being able to run reports for sales and popular items, etc, however because this is going to be a restaurant based setting, I don't think that UberPOS is going to meet his needs.

Does anyone know of a module that we could use that would allow us to ring drinks and other coffee shop goodies through an internal drupal website? Keep in mind, with drinks also comes the ability to request different types of milk, etc.

I can use all of the help I can get, so thank you in advance!