(4-traders.com) April 25--PORTLAND, Maine -- The Gardiner-based distributor Pine State Trading Co. has agreed to sell its convenience store supply business to the national distributor Core-Mark, for about $112 million. Core-Mark, a publicly traded company based in South San Francisco, estimated the transaction price in a news release to investors Monday. Pine...http://www.4-traders.com/CORE-MARK-HOLDING-COMPANY-8867/news/Core-Mark-Pine-State-Trading-sells-convenience-store-supply-business-for-112M-22236041/