There are many places in second life selling 'buisness in a box' or 'affilaite oppurtunities' and actively encourage you to go to clubs, malls, etc. to start selling your product if you can't afford land or property yet.
However, there is no clear list containing all the places that allow free sellers.
So if you have a club/venue/event that you are willing to have dealers, escorts, prostitutes, etc. outside/inside please add your name/venue to this forum.
Of course nobody should expect anything totally free, so newbies looking at this list please at least make a donation to the place you start selling from.
Thank you very much everyone.