The bonds shall be sold to the highest and best bidder at not less than their par value and accrued interest. The county board shall advertise for proposals to purchase the bonds. Such advertisement shall be published at least once in a newspaper having circulation within the county at least 10 days prior to the date for opening the bids. The county board may reserve the right to reject any and all bids and to readvertise for bids.
55 ILCS 5/6-5010