If you know tanmanbaseballfan, you know that he LOVES craig's list.  I happily post on CL quite regularly to keep the new cardboard flowing.  While it isn't exactly a huge profit center, it allows me to not get smacked by mrs tanmanbaseballfan for loading the house up with too much cardboard. I posted the following the other day:  http://houston.craigslist.org/clt/2726503863.html - several hundred stars, rookies, inserts, serial #ed, etc. for $125.  I've been selling boxes like this for quite some time to happy collectors.  Yesterday, I got a call from a "private number".  I could barely hear him with all the background