edHelper.com is a subscription based resource website. Subscription ranges from about $20 a month to $40 a month, depending upon your requirements.
Quote from their web site: "Thank you for your interest in edHelper.com. edHelper.com is dedicated to providing teachers a single shop for educational resources. edHelper was created by a team of teachers who have edhelped (!) in its development. For contact information, please visit the subscription order page."