Trade for purslane starter plants

I have been reading recently about purslane, especially its omega-3 content and would like to grow it for food.  I have a fairly wide range of plants to select from in trade.  

No offers yet.  Purslane is such a common weed.  Do I need to offer something else in trade? 

Here are some links with photos of purslane http://davesgarden.com/guides/articles/view/1547/
http://landscaping.about.com/od/weedsdiseases/ig/weed-plants/Purslane-Photo.htm