1) Absolute lowest point 2) As low as it gets 3) As low as you can go 4) Bad thing to hit 5) Like some prices in ads 6) Lowest level 7) Lowest point 8) Lowest possible level 9) Nadir 10) Nadir, pricewise 11) Plasmatics low note 12) The lowest 13) The lowest point 14) The very lowest level 15) Very lowest 
[n] - the absolute bottom
noun the absolute bottom