you can get the line history, but im not sure how accurate it is:
here is what it shows for the total on the Rangers Game:
TOTALS - OVER/UNDER
11/18 02:48PM: 5 +110 / 5 -130
11/19 01:03PM: 5 +100 / 5 -120
11/19 04:49PM: 5 +105 / 5 -125
11/19 06:40PM: 5 +110 / 5 -130
EDIT: I realize now this is for BOOKMAKER