A conservation license is cheaper but you aren't allowed as many keepers. Only 2 walleye or 25 perch. But from your nickname, it looks like you might be going after ski's, in which case you wouldn't be allowed any keepers.
And it might be cheaper to call the MNR directly. But they take a little bit longer to get to you...a buddy called 2 1/2 weeks ago and is still waiting for his to come in the mail.