Depends on how big you want to expand. Usually if there arent many clutches, you could sell them easy on craigslist to local people. Saves the hassel of certified shipping. However, if you want to expand a good amount, you are going to want to join a forum with a classified section. One, its free opposed to kingsnake.com which is a 100 dollars a year(not bad), and two it keeps you familiar with the people that buy from you. Repeat business is key for successfully profiting off of this wonderfull hobby