PIF stands for Pay It Forward which means you do something nice for someone else or give away something and in return the recipient gives something to someone else.
Well, on Etsy.com they have 2,560 PIF items listed. Generally you just have to pay the postage and cost of the listing (20c) Check it out - here is the link.
http://www.etsy.com/search_results.p...rch_type=al l