Lumber giant Interfor Corp. is buying a sawmill in South Carolina from WestRock Co. for US$59 million in cash.  The news comes as North American lumber prices set new record highs, less than a week after Interfor CEO Ian Fillinger signalled on an earnings call that the cash-rich company is on the hunt for lumber mill acquisitions.  Interfor says the mill it's buying produced about 125 million board feet of lumber in 2020 but has a permit to expand to about 200 million board feet per year.  As a result of ...