Check out this place, above the Hong Kong restaurant in Harvard Square. Ticket prices are very reasonable, only
$8 on Wednesdays, Thursdays and Sundays, and then $12 on
Tuesdays,Fridays and Saturdays. They have a group of comics onstage, one after the other, and you're sure to like at least one (or more) of them. And for $8-12, you really can't go wrong. It's a fun place. It's a small room, and thus, you really can't get a "bad" seat at all. Plus, the waitstaff are pleasant and efficient.