Sorry for misunderstanding you, Doc. Makes perfect sense to distinguish between ticket volume and the actual amount of money wagered to find value on those Unders.
Pregame's Game Center is the only publicly available tool I know of that will reveal and break down a book's handle on a game. The data only comes from sportsbook.com though, like the trends from BetOnline in the Matchups section on vegasinsider.com.
Anyway, keep crushing, and thanks for sharing.