Out the door $5 or less.
As in with tax and/or tip included.
Mine would be Yuca's. At just a shade over $3 (actually 3.25 to be exact if memory serves me right) I'd have enough to spare after tax and tip for a side of sour cream.
There's just something about cooking up a burger patty on a flat top griddle that's been used and abused to make carne asada and carnitas.