I am looking to buy CRM/Backend script or website offering service which has Whitelabel Rights or has unique code not available anywhere else in the market with few months of revenue. If you have one then contact in PM.
I would suggest you to have a look for Zoho CRM (Customer Relationship Management) that will also be known to remain one of the best possible way that one can use. Here you can also get to know about the website offering service with the unique code that is not available anywhere.