I'm sure this will be sort of frowned upon but what about selling stuff on eBay? I know people who buy stuff at yard sales or suchlike and resell it on eBay...
I believe it may be profitable but I am not able to do all of this stuff at once :) And I would like to stay rather with online and virtual goods only (it is to much to go and buy things, then pack it and go to postoffice...). I want to build steady 100% online income.