Website Description   The website of East Hampton Chamber of Commeece provides a wide variety of useful information about East Hamptons. It is a great place to check what is happening in East Hampton.   The website of Riverhead Building Supply Corp. is a good source for the remodeling and building professionals on Long Island. What began as a single lumber yard in Riverhead has grown to become a major retail lumber and building supply operation serving professional contractors all over Long Island.   National Association of Home Builders (NAHB) provides useful information for those who are considering building a custom home. Learn how to find a lot, design your home, and choose the right builder for you. Also, if you need to learn home financing basics before you buy, NAHB has resources to help you calculate your mortgage, find today’s rates, and breeze through your closing.