The Cubs have begun emailing their season ticket renewal forms; many prices have remained the same from last year, some have been reduced.
For example, last year a "platinum" game in the bleachers cost $60. For 2010, that price has been reduced to $54 -- but the number of "platinum" games has been increased from 14 to 26. Other bleacher prices remain the same from 2009.
I do not know if single-game prices will match season ticket prices, but here is the ticket pricing sheet the Cubs sent (link opens .pdf)