Wis. Stat. § 35.57: Advertisement for bids.

The department shall publish advertisements that sealed proposals for furnishing printing, during the next ensuing contract period, with all other material that the department requires, will be received any time prior to a specified day, when all proposals will be publicly opened and read. The advertisements shall be run as class 2 notices, under ch. 985, in the official state paper. Separate advertisements may be used for publications authorized to be published in optical disc format.