We send multiple emails during your subscription period. If you know the email address you subscribed from, I'd simply recommend searching your past emails for "SourceCoast". We also have a "Forgot Username" and "Forgot Password" feature where you can look up both bits of that information. Additionally, our payment services include the username in your invoice. If you used PayPal or Google Checkout, you should be able to find your transaction and look up the username that way.
Hope that helps you locate your subscription information. If you can't find it, let us know, and we can give more suggestions on how to search or search ourselves, but we'd need to know something about the account you purchased the subscription with to begin looking.
Thanks,
Alex