Search Maine Businesses For Sale at BuyMaineBiz.com. If you are looking to purchase a Maine business for sale, or to sell your Maine business, BuyMaineBiz.com is Maine's premier free business-for-sale marketplace. Most common locations of Maine businesses include Portland businesses for sale, Lewiston businesses for sale, and Bangor businesses for sale. Start your search by selecting the type of business and click Search Listings to add more search criteria, or click View Listings to view all the listings in that category.