CONVENIENT FOOD MART <CFMI> AGREES TO BUY CHAIN Convenient Food Mart Inc said it has tentatively agreed to buy all the outstanding stock of Plaid Pantries Inc and two associated businesses in Oregon and Washington for undisclosed terms. Plaid Pantries owns and operates 161 convenience stores in the Portland and Seattle areas. The other business are two companies involved in the wholesale distribution of groceries and health and beauty aids, it said. Closing is expected by May 15.