Try http://gunbroker.com/
OR
http://gunsamerica.com/
These are both online auction sites for guns. I have never used it but if you read their information, it sounds like it is well organized.
Would you mind letting me know what the serial # is. I have one in the exact same condition as yours and it has a very low serial #. I bought it in 1976 when it was introduced for $85.00. I've often wondered if it had any value.
Thanks.
Al...