Covers.com is absolute best. This is data-mining heaven for handicappers.
Here is a link:
http://scores.covers.com/baseball-scores-matchups.aspx?t=0
Now on any event, click "Line Moves." You can see an entire history of line moves for a particular game!
In addition, you can also click "Team", then "History", and on one page, check the scores and closing odds on a team for the entire season! Great stuff.
From here, you are on your own. You should get what you are looking for in only a few minutes.